APA aipamena

Ewins, P., Ewins, P., & Perrins, C. (1986). The ecology of black guillemots Cepphus grylle in Shetland.

Chicago Style aipamena

Ewins, P., Pete Ewins, and C. Perrins. The Ecology of Black Guillemots Cepphus Grylle in Shetland. 1986.

MLA aipamena

Ewins, P., et al. The Ecology of Black Guillemots Cepphus Grylle in Shetland. 1986.