Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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