Cita APA (7a ed.)

Sivertsen, E. (1954). A Survey of the Eared Seals (family Otariidae) with Remarks on the Antartic Seals Collected by M/K "Norvegia" in 1928-1929. Jacob Dybward.

Cita Chicago Style (17a ed.)

Sivertsen, Erling. A Survey of the Eared Seals (family Otariidae) with Remarks on the Antartic Seals Collected by M/K "Norvegia" in 1928-1929. Oslo: Jacob Dybward, 1954.

Cita MLA (9a ed.)

Sivertsen, Erling. A Survey of the Eared Seals (family Otariidae) with Remarks on the Antartic Seals Collected by M/K "Norvegia" in 1928-1929. Jacob Dybward, 1954.