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Check List 1(1):18-22
Cisneros-Heredia, D. F. (2005): Amphibia, Epipedobates biliinguis, Agalychnis calcarifer, Eleutherodactylus croceoinguinis: Distribution Extensions.
Check List 1(1):14-15 
Frost D. R.: Amphibian Species of the World
American Museum of Natural History, New York, USA
Cisneros-Heredia, D. F. (2006): Amphibians, Machalilla National Park, province of Manabí, western Ecuador
Check List 2(1):45-54
Moravec J. (2001): České názvy živočichů IV. Obojživelníci (Amphibia)
Národní muzeum, (zoologické odd.), Praha, 148 pp.
Sandberger L., Hillers A., Doumbia J., Loua N-S,., Brede C., Rödel M-O (2010): Rediscovery of the Liberian Nimba toad, Nimbaphrynoides liberiensis (Xavier, 1978) (Amphibia: Anura: Bufonidae), and reassessment of its taxonomic status
Zootaxa 2355: 56–68