APA ציטוט

Petersen, Æ., Petersen, A., & Perrins, C. (1981). Breeding biology and feeding ecology of Black guillemots.

Chicago Style (17th ed.) Citation

Petersen, Æ, Aevar Petersen, and C. Perrins. Breeding Biology and Feeding Ecology of Black Guillemots. 1981.

ציטוט MLA

Petersen, Æ, et al. Breeding Biology and Feeding Ecology of Black Guillemots. 1981.