APA citiranje

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

Chicago Style (17th ed.) Citation

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

MLA citiranje

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