Michael Polanyi, Personal Knowledge: Towards a Post-Critical Philosophy, ISBN0-226-67288-3, footnote page 10–11: Einstein reports, via Dr N Balzas in response to Polanyi's query, that "The Michelson–Morley experiment had no role in the foundation of the theory." and "..the theory of relativity was not founded to explain its outcome at all."[1]
Michelson, A. A.; Pease, F. G.; Pearson, F. (1929). "Results of repetition of the Michelson–Morley experiment". Journal of the Optical Society of America. 18 (3): 181. Bibcode:1929JOSA...18..181M. doi:10.1364/josa.18.000181.
Jaseja, T. S.; Javan, A.; Murray, J.; Townes, C. H. (1964). "Test of Special Relativity or of the Isotropy of Space by Use of Infrared Masers". Phys. Rev. 133 (5a): 1221–1225. Bibcode:1964PhRv..133.1221J. doi:10.1103/PhysRev.133.A1221.
Trimmer, William S.; Baierlein, Ralph F.; Faller, James E.; Hill, Henry A. (1973). "Experimental Search for Anisotropy in the Speed of Light". Physical Review D. 8 (10): 3321–3326. Bibcode:1973PhRvD...8.3321T. doi:10.1103/PhysRevD.8.3321.
Schumacher, Reinhard A. (1994). "Special Relativity and the Michelson-Morley Interferometer". American Journal of Physics. 62 (7): 609–612. Bibcode:1994AmJPh..62..609S. doi:10.1119/1.17535.
Michelson, A. A.; Pease, F. G.; Pearson, F. (1929). "Results of repetition of the Michelson–Morley experiment". Journal of the Optical Society of America. 18 (3): 181. Bibcode:1929JOSA...18..181M. doi:10.1364/josa.18.000181.
Jaseja, T. S.; Javan, A.; Murray, J.; Townes, C. H. (1964). "Test of Special Relativity or of the Isotropy of Space by Use of Infrared Masers". Phys. Rev. 133 (5a): 1221–1225. Bibcode:1964PhRv..133.1221J. doi:10.1103/PhysRev.133.A1221.
Trimmer, William S.; Baierlein, Ralph F.; Faller, James E.; Hill, Henry A. (1973). "Experimental Search for Anisotropy in the Speed of Light". Physical Review D. 8 (10): 3321–3326. Bibcode:1973PhRvD...8.3321T. doi:10.1103/PhysRevD.8.3321.
Schumacher, Reinhard A. (1994). "Special Relativity and the Michelson-Morley Interferometer". American Journal of Physics. 62 (7): 609–612. Bibcode:1994AmJPh..62..609S. doi:10.1119/1.17535.
Maxwell, James Clerk (1878), "Ether" , in Baynes, T. S. (ed.), Encyclopædia Britannica, vol. 8 (9th ed.), New York: Charles Scribner's Sons, pp. 568–572