APA

Berta A., . (1994). New specimens of the Pinnipediform Pteronarctos from the Miocene of Oregon. Washington, D.C: Smithsonian Institution Press.

Chicago

Berta Annalisa, . 1994. New specimens of the Pinnipediform Pteronarctos from the Miocene of Oregon. Washington, D.C: Smithsonian Institution Press.

Harvard

Berta A., . (1994). New specimens of the Pinnipediform Pteronarctos from the Miocene of Oregon. Washington, D.C: Smithsonian Institution Press.

MLA

Berta Annalisa, . New specimens of the Pinnipediform Pteronarctos from the Miocene of Oregon. Washington, D.C: Smithsonian Institution Press. 1994.