Kristina Prus (May 14, 2008). Kellie Whittaker (ed.). "Trachycephalus typhonius". Amphibiaweb. Retrieved February 21, 2022.
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Enrique La Marca; Claudia Azevedo-Ramos; Norman Scott; Lucy Aquino; Débora Silvano; Luis A. Coloma; Santiago Ron; Julian Faivovich; Georgina Santos-Barrera; Frank Solís; Roberto Ibáñez; Federico Bolaños; Larry David Wilson; Jerry Hardy; Paulino Ponce (2010). "Trachycephalus typhonius". 3.1. The IUCN Red List of Threatened Species: e.T55824A95508779. doi:10.2305/IUCN.UK.2010-2.RLTS.T55824A11373788.en. 55824. Retrieved February 21, 2022. {{cite journal}}: Cite journal requires |journal= (help)
iucnredlist.org
Enrique La Marca; Claudia Azevedo-Ramos; Norman Scott; Lucy Aquino; Débora Silvano; Luis A. Coloma; Santiago Ron; Julian Faivovich; Georgina Santos-Barrera; Frank Solís; Roberto Ibáñez; Federico Bolaños; Larry David Wilson; Jerry Hardy; Paulino Ponce (2010). "Trachycephalus typhonius". 3.1. The IUCN Red List of Threatened Species: e.T55824A95508779. doi:10.2305/IUCN.UK.2010-2.RLTS.T55824A11373788.en. 55824. Retrieved February 21, 2022. {{cite journal}}: Cite journal requires |journal= (help)