APA aipamena

Jacobs, H. (2012). Mama Grizzly and the polar bears. Nature Publishing Group.

Chicago Style aipamena

Jacobs, Howy. Mama Grizzly and the Polar Bears. Nature Publishing Group, 2012.

MLA aipamena

Jacobs, Howy. Mama Grizzly and the Polar Bears. Nature Publishing Group, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.