Augustus De Morgan (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Augustus De Morgan" in English language version.

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Karpinski 1916, pp. 468–471. Karpinski, Louis (1916). "Review: A Budget of Paradoxes (2nd edn.), by Augustus De Morgan". Bull. Amer. Math. Soc. 22 (9): 468–471. doi:10.1090/s0002-9904-1916-02839-4.

archive.org

De Morgan & De Morgan 1882, p. 18. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan 1840a. The Elements of Arithmetic (4th ed.). London: Taylor & Walton. 1840a.
De Morgan 1836. An Explanation of the Gnomonic Projection of the Sphere. London: Baldwin. 1836.
De Morgan 1842. The Differential and Integral Calculus. London: Baldwin. 1842.
De Morgan 1845. The Globes, Celestial and Terrestrial. London: Malby & Co. 1845.
De Morgan & De Morgan 1882, p. 53. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 110. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 279. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 363. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan 1838. An Essay on Probabilities, and Their Application to Life Contingencies and Insurance Offices. London: Longman, Orme, Brown, Green & Longmans. 1838.
De Morgan & De Morgan 1882, p. 42. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan 1849. Trigonometry and Double Algebra. London: Taylor, Walton & Malbery. 1849.
De Morgan 1839. De Morgan, Augustus (1839). First Notions of Logic, Preparatory to the Study of Geometry. London: Taylor & Walton.
Bochenski 1961. Bochenski, Joseph M. (1961). History of Formal Logic. Notre Dame.
De Morgan & De Morgan 1882, pp. 173–175. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 268–269. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
Mary Everest Boole (1901). Indian Thought and Western Science in the Nineteenth Century. Library Genesis. The Ceylon National Review.
De Morgan & De Morgan 1882, pp. 10–14. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 88. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 186–187. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 339–345. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 86. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 365. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 393. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan 1838, pp. 22–23. An Essay on Probabilities, and Their Application to Life Contingencies and Insurance Offices. London: Longman, Orme, Brown, Green & Longmans. 1838.
De Morgan & De Morgan 1882, p. 368. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
Bochenski 1961, p. 296. Bochenski, Joseph M. (1961). History of Formal Logic. Notre Dame.
De Morgan 1847. De Morgan, Augustus (1847). Formal Logic or The Calculus of Inference, Necessary and Probable. London: Taylor & Walton.
C. I. Lewis (1918) Survey of Symbolic Logic, page 37, via Internet Archive
De Morgan 1860, pp. 208–46. De Morgan, Augustus (1860). Syllabus of a Proposed System of Logic. London: Walton & Malbery.
De Morgan & De Morgan 1882, pp. 401–415. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan 1837b. Elements of Algebra. London: Taylor & Walton. 1837b.
Hamilton 1853, p. 16. Hamilton, Sir William Rowan (1853). Lectures on Quaternions. Dublin: Hodges and Smith.
De Morgan 1860. De Morgan, Augustus (1860). Syllabus of a Proposed System of Logic. London: Walton & Malbery.
Conklin 1955, pp. 95–99. Conklin, Groff (March 1955). "Galaxy's 5 Star Shelf". Galaxy Science Fiction.

books.google.com

De Morgan & De Morgan 1882, p. 18. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 53. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 110. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 279. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 363. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 42. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 173–175. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 268–269. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 10–14. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 88. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 186–187. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, pp. 339–345. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 86. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 365. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
Beloff 1997, p. 47. Beloff, John (1997). Parapsychology: A Concise History. Palgrave Macmillan. ISBN 978-0-312-17376-0.
De Morgan & De Morgan 1882, p. 393. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
De Morgan & De Morgan 1882, p. 368. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
Merrill 2012, p. 49. Merrill, Daniel D. (2012). Augustus De Morgan and the Logic of Relations. Springer Science & Business Media. ISBN 978-94-009-2047-7.
De Morgan & De Morgan 1882, pp. 401–415. De Morgan, Sophia Elizabeth; De Morgan, Augustus (1882). Memoir of Augustus De Morgan: With Selections from His Letters. Longmans, Green, and Company. ISBN 978-1-108-01447-2. Also available on Google Books
Nelson 1969, p. 90. Nelson, Geoffrey K. (1969). Spiritualism and Society. Routledge & K. Paul. ISBN 9780710062529.
Oppenheim 1985, p. 335. Oppenheim, Janet (1985). The Other World: Spiritualism and Psychical Research in England, 1850–1914. Cambridge University Press. p. 335. ISBN 0-521-34767-X.
Beloff 1997. Beloff, John (1997). Parapsychology: A Concise History. Palgrave Macmillan. ISBN 978-0-312-17376-0.

cam.ac.uk

venn.lib.cam.ac.uk

"De Morgan, Augustus (D823A)". A Cambridge Alumni Database. University of Cambridge.

doi.org

"Morgan, Augustus de (1806–1871), mathematician and historian". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/7470. ISBN 978-0-19-861412-8. (Subscription or UK public library membership required.)
Panteki 2003. Panteki, Maria (2003). "French "logique" and British "logic": on the origins of Augustus De Morgan's early logical inquiries, 1805-1835". Historia Mathematica. 30 (3): 278–340. doi:10.1016/S0315-0860(03)00025-9.
Rice 1997b. Rice, Adrian (September 1997b). "Inspiration or desperation? Augustus De Morgan's appointment to the chair of mathematics at London University in 1828". The British Journal for the History of Science. 30 (3): 257–274. doi:10.1017/S0007087497003075. JSTOR 4027861.
Phillips 2005. Phillips, Christopher (2005). "Augustus De Morgan and the propagation of moral mathematics". Studies in History and Philosophy of Science. 36 (1): 105–133. Bibcode:2005SHPSA..36..105P. doi:10.1016/j.shpsa.2004.12.006.
Hollings, Martin & Rice 2017, p. 5. Hollings, Christopher; Martin, Ursula; Rice, Adrian (2017). "The Lovelace-De Morgan mathematical correspondence: A critical re-appraisal". Historia Mathematica. 44 (3): 202–231. doi:10.1016/j.hm.2017.04.001. hdl:20.500.11820/0e6b1303-667f-4356-b33d-7123ae973bc4.
Simmons 2011. Simmons, Charlotte (2011). "Augustus De Morgan Behind the Scenes". The College Mathematics Journal. 42 (1): 33–40. doi:10.4169/college.math.j.42.1.033.
Rice 1999. Rice, Adrian (1999). "What Makes a Great Mathematics Teacher? The Case of Augustus De Morgan". The American Mathematical Monthly. 106 (6): 534–552. doi:10.2307/2589465. JSTOR 2589465.
Robertson 1951. Robertson, Ross M. (1951). "Jevons and his precursors". Econometrica. 19 (3): 229–249. doi:10.2307/1906812. JSTOR 1906812.
Black 1972. Black, R.D. Collison (1972). "Jevons, Bentham and De Morgan". Economica. 39 (154): 119–134. doi:10.2307/2552637. JSTOR 2552637.
Pycior 1983. Pycior, Helena M. (1983). "Augustus De Morgan's Algebraic Work: The Three Stages". Isis. 74 (2): 211–226. doi:10.1086/353244. JSTOR 233103.
Richards 1987. Richards, Joan L. (1987). "Augustus De Morgan, the History of Mathematics, and the Foundations of Algebra". Isis. 78 (1): 6–30. doi:10.1086/354328.
Ganeri, Dr Jonardon (1 February 2013). Indian Logic. doi:10.4324/9780203037119. ISBN 9780203037119.
Higgitt 2006. Higgitt, Rebekah (2006). "Why I Don't FRS My Tail: Augustus De Morgan and the Royal Society". Notes and Records of the Royal Society of London. 60 (3): 253–259. doi:10.1098/rsnr.2006.0150.
Richards 1987, p. 10. Richards, Joan L. (1987). "Augustus De Morgan, the History of Mathematics, and the Foundations of Algebra". Isis. 78 (1): 6–30. doi:10.1086/354328.
Smith 1981. Smith, G.C. (1981). "De Morgan and the laws of algebra". Centaurus. 25 (1): 50–70. Bibcode:1981Cent...25...50S. doi:10.1111/j.1600-0498.1981.tb00639.x.
Macfarlane 1899. Macfarlane, Alexander (1899). "The fundamental principles of algebra". Science. 10 (246): 345–364. Bibcode:1899Sci....10..345M. doi:10.1126/science.10.246.345. JSTOR 1627482. PMID 17745050.
Despaux & Rice 2016. Despaux, Sloan Evans; Rice, Adrian C. (2016). "Augustus De Morgan's anonymous reviews for The Athenæum: A mirror of a Victorian mathematician". Historia Mathematica. 43 (2): 148–171. doi:10.1016/j.hm.2015.09.001.
Karpinski 1916, pp. 468–471. Karpinski, Louis (1916). "Review: A Budget of Paradoxes (2nd edn.), by Augustus De Morgan". Bull. Amer. Math. Soc. 22 (9): 468–471. doi:10.1090/s0002-9904-1916-02839-4.

dx.doi.org

Ganeri, Dr Jonardon (1 February 2013). Indian Logic. doi:10.4324/9780203037119. ISBN 9780203037119.

gutenberg.org

De Morgan 1831. De Morgan, Augustus (1831). On the Study and Difficulties of Mathematics.
De Morgan 1872, p. 87. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 255. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 332. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 338. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, pp. 306–308. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 170. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 164. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, pp. 249–250. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 474. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 82. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, pp. 234–235. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.
De Morgan 1872, p. 377. De Morgan, Augustus (1872). A Budget of Paradoxes. London: Longmans, Green.

handle.net

hdl.handle.net

Hollings, Martin & Rice 2017, p. 5. Hollings, Christopher; Martin, Ursula; Rice, Adrian (2017). "The Lovelace-De Morgan mathematical correspondence: A critical re-appraisal". Historia Mathematica. 44 (3): 202–231. doi:10.1016/j.hm.2017.04.001. hdl:20.500.11820/0e6b1303-667f-4356-b33d-7123ae973bc4.

harvard.edu

ui.adsabs.harvard.edu

Phillips 2005. Phillips, Christopher (2005). "Augustus De Morgan and the propagation of moral mathematics". Studies in History and Philosophy of Science. 36 (1): 105–133. Bibcode:2005SHPSA..36..105P. doi:10.1016/j.shpsa.2004.12.006.
Smith 1981. Smith, G.C. (1981). "De Morgan and the laws of algebra". Centaurus. 25 (1): 50–70. Bibcode:1981Cent...25...50S. doi:10.1111/j.1600-0498.1981.tb00639.x.
Macfarlane 1899. Macfarlane, Alexander (1899). "The fundamental principles of algebra". Science. 10 (246): 345–364. Bibcode:1899Sci....10..345M. doi:10.1126/science.10.246.345. JSTOR 1627482. PMID 17745050.

hathitrust.org

babel.hathitrust.org

De Morgan (1846) "On the structure of the syllogism". De Morgan, Augustus (1846). "On the structure of the syllogism, and on the application of the theory of probabilities to questions of argument and authority". Transactions of the Cambridge Philosophical Society. 8 XXIX: 379–408.

jstor.com

Higgitt 2006. Higgitt, Rebekah (2006). "Why I Don't FRS My Tail: Augustus De Morgan and the Royal Society". Notes and Records of the Royal Society of London. 60 (3): 253–259. doi:10.1098/rsnr.2006.0150.

jstor.org

Rice 1997b. Rice, Adrian (September 1997b). "Inspiration or desperation? Augustus De Morgan's appointment to the chair of mathematics at London University in 1828". The British Journal for the History of Science. 30 (3): 257–274. doi:10.1017/S0007087497003075. JSTOR 4027861.
Arcavi & Bruckheimer 1989. Arcavi, Abraham; Bruckheimer, Maxim (1989). "The Didactical De Morgan: A Selection of Augustus De Morgan's Thoughts on Teaching and Learning Mathematics". For the Learning of Mathematics. 9 (1): 34–39. JSTOR 40247943.
Rice 1999. Rice, Adrian (1999). "What Makes a Great Mathematics Teacher? The Case of Augustus De Morgan". The American Mathematical Monthly. 106 (6): 534–552. doi:10.2307/2589465. JSTOR 2589465.
Robertson 1951. Robertson, Ross M. (1951). "Jevons and his precursors". Econometrica. 19 (3): 229–249. doi:10.2307/1906812. JSTOR 1906812.
Black 1972. Black, R.D. Collison (1972). "Jevons, Bentham and De Morgan". Economica. 39 (154): 119–134. doi:10.2307/2552637. JSTOR 2552637.
Pycior 1983. Pycior, Helena M. (1983). "Augustus De Morgan's Algebraic Work: The Three Stages". Isis. 74 (2): 211–226. doi:10.1086/353244. JSTOR 233103.
Whittaker 1944. Whittaker, E.T. (1944). "The sequence of ideas in the discovery of quaternions". Proceedings of the Royal Irish Academy A. 50: 93–98. JSTOR 20520633.
Macfarlane 1899. Macfarlane, Alexander (1899). "The fundamental principles of algebra". Science. 10 (246): 345–364. Bibcode:1899Sci....10..345M. doi:10.1126/science.10.246.345. JSTOR 1627482. PMID 17745050.

lms.ac.uk

"History|London Mathematical Society".

mdx.ac.uk

repository.mdx.ac.uk

Rice 1997, p. 38. Rice, Adrian Clifford (1997). Augustus De Morgan and the development of university mathematics in London in the nineteenth century (Thesis). Middlesex University.
Rice 1997, pp. 36–54. Rice, Adrian Clifford (1997). Augustus De Morgan and the development of university mathematics in London in the nineteenth century (Thesis). Middlesex University.
Rice 1997, pp. 92–97. Rice, Adrian Clifford (1997). Augustus De Morgan and the development of university mathematics in London in the nineteenth century (Thesis). Middlesex University.
Rice 1997, pp. 108–122. Rice, Adrian Clifford (1997). Augustus De Morgan and the development of university mathematics in London in the nineteenth century (Thesis). Middlesex University.

nih.gov

pubmed.ncbi.nlm.nih.gov

Macfarlane 1899. Macfarlane, Alexander (1899). "The fundamental principles of algebra". Science. 10 (246): 345–364. Bibcode:1899Sci....10..345M. doi:10.1126/science.10.246.345. JSTOR 1627482. PMID 17745050.

oxforddnb.com

"Morgan, Augustus de (1806–1871), mathematician and historian". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/7470. ISBN 978-0-19-861412-8. (Subscription or UK public library membership required.)

rasc.ca

Royal Astronomical Society of Canada. "The Astronomer's Drinking Song". Royal Astronomical Society of Canada. 10 December 2013.

scihi.org

Sack, Harald (27 June 2019). "Augustus de Morgan and Formal Logic". SciHi Blog. Retrieved 15 June 2022.

tandfonline.com

Simmons 2011. Simmons, Charlotte (2011). "Augustus De Morgan Behind the Scenes". The College Mathematics Journal. 42 (1): 33–40. doi:10.4169/college.math.j.42.1.033.

ucl.ac.uk

discovery.ucl.ac.uk

Harte, North & Brewis 2018, p. 39. Harte, Negley; North, John; Brewis, Georgina (2018). The World of UCL (PDF) (4th ed.). London: UCL Press. ISBN 978-1-78735-294-0.
Harte, North & Brewis 2018, pp. 41–47. Harte, Negley; North, John; Brewis, Georgina (2018). The World of UCL (PDF) (4th ed.). London: UCL Press. ISBN 978-1-78735-294-0.
Harte, North & Brewis 2018, p. 65. Harte, Negley; North, John; Brewis, Georgina (2018). The World of UCL (PDF) (4th ed.). London: UCL Press. ISBN 978-1-78735-294-0.
Harte, North & Brewis 2018, p. 41. Harte, Negley; North, John; Brewis, Georgina (2018). The World of UCL (PDF) (4th ed.). London: UCL Press. ISBN 978-1-78735-294-0.

wikipedia.org

de.wikipedia.org

Note that Leibniz's writings on the calculus ratiocinator predate De Morgan by a century but remained unpublished until 1901. A similar but ultimately unsuccessful effort to define a mathematical system of logic by Johann Heinrich Lambert, Georg Jonathan von Holland [de], and Gottfried Ploucquet [de] remained unpublished correspondences.^[46]

wikisource.org

en.wikisource.org

Jevons 1878. Jevons, William Stanley (1878). "Augustus De Morgan" . Encyclopædia Britannica. Vol. VII (9th ed.). pp. 64–67.
Stephen, Leslie, ed. (1889). "Frend, William" . Dictionary of National Biography. Vol. 20. London: Smith, Elder & Co.