APA aipamena

E. Ramírez Albores, J. (2007). Bird diversity and conservation of Alto Balsas (Southwestern Puebla), Mexico.

Chicago Style aipamena

E. Ramírez Albores, Jorge. Bird Diversity and Conservation of Alto Balsas (Southwestern Puebla), Mexico. 2007.

MLA aipamena

E. Ramírez Albores, Jorge. Bird Diversity and Conservation of Alto Balsas (Southwestern Puebla), Mexico. 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.