Darwin, 1859, pp. 134–139. Barrett P. H. et al. 1981, A concordance to Darwin's Origin of Species first edition, Cornaell, Ithaca and London, lists only four mentions of the phrase "use and disuse".
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Bejder L, Hall BK «Limbs in whales and limblessness in other vertebrates: mechanisms of evolutionary and developmental transformation and loss». Evol. Dev., vol. 4, 6, 2002, pàg. 445–58. DOI: 10.1046/j.1525-142X.2002.02033.x. PMID: 12492145.
Saraga-Babić M, Lehtonen E, Svajger A, Wartiovaara J «Morphological and immunohistochemical characteristics of axial structures in the transitory human tail». Ann. Anat., vol. 176, 3, 1994, pàg. 277–86. PMID: 8059973.