1. Arregui, L., Diaz-Diaz, S., Alonso-López, E., and Kouba, A.J., Hormonal induction of spermiation in a Eurasian bufonid (Epidalea calamita), Reprod. Biol. Endocrinol., 2019, vol. 17, p. 92. https://doi.org/10.1186/s12958-019-0537-0
2. Bannikov, A.G., Darevskii, I.S., Ishchenko, V.G., Rustamov, A.K., and Shcherbak, N.N., Opredelitel’ zemnovodnykh i presmykayushchikhsya fauny SSSR (Identification Guide to Amphibians and Reptiles of the Fauna of the USSR), Moscow: Prosveshchenie, 1977.
3. Beebee, T.J.C., Environmental change as a cause of natterjack toad Bufo calamita declines in Britain, Biol. Conserv., 1977, vol. 11, pp. 87–102.
4. Beebee, T.J.C., The natterjack toad Bufo calamita in Ireland: current status and conservation requirements, Irish Wildlife Manuals, 2002, no. 10, p. 34.
5. Beebee, T., Cabido, C., Eggert, C., Mestre, I.G., Iraola, A., et al., 40 years of natterjack toad conservation in Europe, FrogLog, 2012, vol. 101, pp. 40–44.