↑Baldissera, Caramaschi & Haddad, 2004 : Review of the Bufo crucifer species group, with descriptions of two new related species (Amphibia, Anura, Bufonidae). Arquivos do Museu Nacional, Rio de Janeiro, vol. 62, no 3, p. 255-282 (texte intégral).
↑Thomé, Zamudio, Haddad & Alexandrino, 2012 : Delimiting genetic units in Neotropical toads under incomplete lineage sorting and hybridization. BMC Evolutionary Biology, vol. 12, p. 1-13 (texte intégral).