Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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