APA (7th ed.) Citation

Fet, V., & Popov, A. (2007). Biogeography and ecology of Bulgaria. Springer.

Chicago Style (17th ed.) Citation

Fet, Victor, and Alexi Popov. Biogeography and Ecology of Bulgaria. Dordrecht: Springer, 2007.

MLA (8th ed.) Citation

Fet, Victor, and Alexi Popov. Biogeography and Ecology of Bulgaria. Springer, 2007.