Tohutoro APA (7th ed.)
Richdale, L. E. (1957). A Population Study of penguins. Clarendon Pr.
Tohutoru Kātū Chicago (17th ed.)
Richdale, Lancelot Eric. A Population Study of Penguins. Oxford: Clarendon Pr, 1957.
Tohutoro MLA (9th ed.)
Richdale, Lancelot Eric. A Population Study of Penguins. Clarendon Pr, 1957.
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