Mata-López, R., García-Prieto, L., & León-Règagnon, V. (2010). Helminths of the American bullfrog, Lithobates catesbeianus (Shaw, 1802), from Pawnee Lake, Lancaster, Nebraska, USA with a checklist of its helminth parasites. Zootaxa, 2544(1), 1–53. https://doi.org/10.11646/zootaxa.2544.1.1