Cita APA (7th ed.)

Cross, D., Jonkel, C., Robertson, R., Smith, P., & Stirling, I. The ecology of the polar bear (Ursus maritimus) along the western coast of the Hudson Bay.

Cita Chicago (17th ed.)

Cross, Dale, Charles Jonkel, Richard Robertson, Pauline Smith, i Ian Stirling. The Ecology of the Polar Bear (Ursus Maritimus) Along the Western Coast of the Hudson Bay.

Cita MLA (9th ed.)

Cross, Dale, et al. The Ecology of the Polar Bear (Ursus Maritimus) Along the Western Coast of the Hudson Bay.