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Einstein, A. (1905). «Über einen die Erzeugung und Verwandlung des Lichtes betreffenden heuristischen Gesichtspunkt» [On a heuristic viewpoint concerning the production and transformation of light]. Annalen der Physik. 322 (6): 132–148. Bibcode:1905AnP...322..132E. doi:10.1002/andp.19053220607.
H. W. Turnbull (1940–1941). «Early Scottish Relations with the Royal Society: I. James Gregory, F.R.S. (1638–1675)». Notes and Records of the Royal Society of London. 3: 22. JSTOR531136. doi:10.1098/rsnr.1940.0003.
Einstein, A. (1967). «On a heuristic viewpoint concerning the production and transformation of light». I Ter Haar, D. The Old Quantum Theory. Pergamon. s.91–107. Besøkt 18. mars 2010. The chapter is an English translation of Einstein's 1905 paper on the photoelectric effect.
Rashed, Roshdi (1990). «A pioneer in anaclastics: Ibn Sahl on burning mirrors and lenses». Isis. 81 (3): 464–491. JSTOR233423. doi:10.1086/355456.
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C. H. Townes. «The first laser». University of Chicago. Besøkt 15. mai 2008.
C. H. Townes (2003). «The first laser». I Laura Garwin and Tim Lincoln. A Century of Nature: Twenty-One Discoveries that Changed Science and the World. University of Chicago Press. s.107–12. ISBN0-226-28413-1.