Guerra, C., D. Baldo, S. Rosset, C. Borteiro, and F. Kolenc. “Advertisement and Release Calls in Neotropical Toads of the Rhinella granulosa Group and Evidence of Natural Hybridization Between R. bergi and R. major (Anura: Bufonidae)”. Zootaxa, vol. 3092, no. 1, Nov. 2011, pp. 26-42, doi:10.11646/zootaxa.3092.1.2.