APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.