^Frost, Darrel R. (2018). "Brachycephalus didactylus (Izecksohn, 1971)". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 1 May 2018.
^Ribeiro, L.F.; Alves, A.C.R.; Haddad, C.F.B.; Dos Reis, S.F. (2005). "Two new species of Brachycephalus Günther, 1858 from the State of Paraná, southern Brazil (Amphibia, Anura, Brachycephalidae)". Bol. Mus. Nac. Rio J. Zool. 519: 1–18.
^Moratelli, Ricardo; Peracchi, Adriano L.; Dias, Daniela; De Oliveira, João A. (2011). "Geographic variation in South American populations of Myotis nigricans (Schinz, 1821) (Chiroptera, Vespertilionidae), with the description of two new species". Mammalian Biology. 76 (5): 592–607. doi:10.1016/j.mambio.2011.01.003.