Cita APA (7a ed.)

Klenina, A., Ruchin, A., & Bykov, E. (2021). Occurrence of the birds of the Middle Volga Region (South-East of the European part of Russia). Pensoft Publishers.

Cita Chicago Style (17a ed.)

Klenina, Anastasia, Alexander Ruchin, y Evgenii Bykov. Occurrence of the Birds of the Middle Volga Region (South-East of the European Part of Russia). Pensoft Publishers, 2021.

Cita MLA (8a ed.)

Klenina, Anastasia, et al. Occurrence of the Birds of the Middle Volga Region (South-East of the European Part of Russia). Pensoft Publishers, 2021.