William Smyth, Elementary algebra: for schools and academies, Publisher Bailey and Noyes, 1864, "Operasi Aljabar"
Horatio Nelson Robinson, New elementary algebra: containing the rudiments of science for schools and academies, Ivison, Phinney, Blakeman, & Co., 1866, halaman 7
Richard N. Aufmann, Joanne Lockwood, Introductory Algebra: An Applied Approach, Publisher Cengage Learning, 2010, ISBN1439046042, 9781439046043, page 78
William L. Hosch (editor), The Britannica Guide to Algebra and Trigonometry, Britannica Educational Publishing, The Rosen Publishing Group, 2010, ISBN1615302190, 9781615302192, page 71
Horatio Nelson Robinson, New elementary algebra: containing the rudiments of science for schools and academies, Ivison, Phinney, Blakeman, & Co., 1866, page 7
Ron Larson, Robert Hostetler, Bruce H. Edwards, Algebra And Trigonometry: A Graphing Approach, Publisher: Cengage Learning, 2007, ISBN061885195X, 9780618851959, 1114 pages, page 6
Sin Kwai Meng, Chip Wai Lung, Ng Song Beng, "Algebraic notation", in Mathematics Matters Secondary 1 Express Textbook, Publisher Panpac Education Pte Ltd, ISBN9812738827, 9789812738820, page 68
David Alan Herzog, Teach Yourself Visually Algebra, Publisher John Wiley & Sons, 2008, ISBN0470185597, 9780470185599, 304 halaman, page 72
John C. Peterson, Technical Mathematics With Calculus, Publisher Cengage Learning, 2003, ISBN0766861899, 9780766861893, 1613 halaman, page 31
Jerome E. Kaufmann, Karen L. Schwitters, Algebra for College Students, Publisher Cengage Learning, 2010, ISBN0538733543, 9780538733540, 803 pages, halaman 222
Ramesh Bangia, Dictionary of Information Technology, Publisher Laxmi Publications, Ltd., 2010, ISBN9380298153, 9789380298153, page 212
George Grätzer, Langkah Pertama di LaTeX, Publisher Springer, 1999, ISBN0817641327, 9780817641320, halaman 17
S. Tucker Taft, Robert A. Duff, Randall L. Brukardt, Erhard Ploedereder, Pascal Leroy, Ada 2005 Reference Manual, Volume 4348 dari Catatan Kuliah di Ilmu Komputer, Penerbit Springer, 2007, ISBN3540693351, 9783540693352, halaman 13
C. Xavier, Fortran 77 And Numerical Methods, Penerbit New Age International, 1994, ISBN812240670X, 9788122406702, halaman 20
Randal Schwartz, Brian Foy, Tom Phoenix, Learning Perl, Publisher O'Reilly Media, Inc., 2011, ISBN1449313140, 9781449313142, halaman 24
Matthew A. Telles, Python Power!: The Comprehensive Guide, Publisher Course Technology PTR, 2008, ISBN1598631586, 9781598631586, halaman 46
Kevin C. Baird, Ruby by Example: Concepts and Code, Publisher No Starch Press, 2007, ISBN1593271484, 9781593271480, page 72
William P. Berlinghoff, Fernando Q. Gouvêa, Math through the Ages: A Gentle History for Teachers and Others, Publisher MAA, 2004, ISBN0883857367, 9780883857366, halaman 75
Thomas Sonnabend, Mathematics for Teachers: An Interactive Approach for Grades K-8, Penerbit: Cengage Learning, 2009, ISBN0495561665, 9780495561668, 759 pages, halaman xvii
Lewis Hirsch, Arthur Goodman, Understanding Elementary Algebra With Geometry: A Course for College Students, Penerbit: Cengage Learning, 2005, ISBN0534999727, 9780534999728, 654 halaman, halaman 48
Lawrence S. Leff, College Algebra: Barron's Ez-101 Study Keys, Penerbit: Seri Pendidikan Barron, 2005, ISBN0764129147, 9780764129148, 230 pages, halaman 2
Charles P. McKeague, Elementary Algebra, Penerbit: Cengage Learning, 2011, ISBN0840064217, 9780840064219, 571 halaman, halaman 49
Andrew Marx, Shortcut Algebra I: A Quick and Easy Way to Increase Your Algebra I Knowledge and Test Scores, Penerbit Kaplan Publishing, 2007, ISBN1419552880, 9781419552885, 288 halaman, halaman 51[pranala nonaktif permanen]
Mark Clark, Cynthia Anfinson, Beginning Algebra: Connecting Concepts Through Applications, Pembelajaran Cengage Penerbit, 2011, ISBN0534419380, 9780534419387, 793 pages, halaman 134
Alan S. Tussy, R. David Gustafson, Elementary and Intermediate Algebra, Pembelajaran Cengage Penerbit, 2012, ISBN1111567689, 9781111567682, 1163 pages, halaman 493
Euler, Leonhard; Hewlett, John; Horner, Francis; Bernoulli, Jean; Lagrange, Joseph Louis (4 May 2018). "Elements of Algebra". Longman, Orme. Diakses tanggal 4 May 2018 – via Google Books.
