Allen, J. A. (1880). History of North American pinnipeds: A monograph of the walruses, sea-lions, sea-bears and seals of North America. Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Allen, Joel A. History of North American Pinnipeds: A Monograph of the Walruses, Sea-lions, Sea-bears and Seals of North America. Washington: Gov. Print. Off, 1880.
MLA-Zitierstil (9. Ausg.)Allen, Joel A. History of North American Pinnipeds: A Monograph of the Walruses, Sea-lions, Sea-bears and Seals of North America. Gov. Print. Off, 1880.
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