Cita APA (7th ed.)

Suydam, R. S., & George, J. C. (1992). Recent sightings of Harbour Porpoises, Phocoena phocoena, near Point Barrow, Alaska. Zenodo.

Cita Chicago (17th ed.)

Suydam, Robert S., i John Craighead George. Recent Sightings of Harbour Porpoises, Phocoena Phocoena, Near Point Barrow, Alaska. Zenodo, 1992.

Cita MLA (9th ed.)

Suydam, Robert S., i John Craighead George. Recent Sightings of Harbour Porpoises, Phocoena Phocoena, Near Point Barrow, Alaska. Zenodo, 1992.