Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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