Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.