Roberto, I. J., E. M. D. Santos, and T. R. de Carvalho. “The Vocalization of Gastrotheca fissipes (Boulenger, 1888) (Anura, Hemiphractidae) from the State of Pernambuco, Northeastern Brazil”. Zootaxa, vol. 4543, no. 2, Jan. 2019, pp. 284–286, doi:10.11646/zootaxa.4543.2.6.