Kaefer, I. L., L. K. Erdtmann, and A. P. Lima. “The Advertisement Call of Physalaemus Ephippifer (Anura: Leiuperidae) from Brazilian Amazonia”. Zootaxa, vol. 2929, no. 1, June 2011, pp. 57–58, doi:10.11646/zootaxa.2929.1.5.