Darwin, 1859, pp. 134–139. Barrett P. H. et al. 1981, A concordance to Darwin's Origin of Species first edition, Cornell, Ithaca, and London, lists only four mentions of the phrase "use and disuse".
Saraga-Babić M, Lehtonen E, Svajger A, Wartiovaara J (1994). "Morphological and immunohistochemical characteristics of axial structures in the transitory human tail". Ann. Anat. 176 (3): 277–86. doi:10.1016/s0940-9602(11)80496-6. PMID8059973.
Saraga-Babić M, Lehtonen E, Svajger A, Wartiovaara J (1994). "Morphological and immunohistochemical characteristics of axial structures in the transitory human tail". Ann. Anat. 176 (3): 277–86. doi:10.1016/s0940-9602(11)80496-6. PMID8059973.