APA (7th ed.) Zitazioa

Clapham, R. The Book of the Otter: A manual for sportsmen and naturalists.

Chicago Style (17th ed.) Zitazioa

Clapham, Richard. The Book of the Otter: A Manual for Sportsmen and Naturalists.

MLA (9th ed.) Zitazioa

Clapham, Richard. The Book of the Otter: A Manual for Sportsmen and Naturalists.

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