APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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