Kotpal, R. L. (2009). Modern text book of zoology : vertebrates: Vertebrates. Meerut.
Lua i Stíl Chicago (17ú heag.)Kotpal, R. L. Modern Text Book of Zoology : Vertebrates: Vertebrates. Rastogi Publications: Meerut, 2009.
Lua MLA (9ú heag.)Kotpal, R. L. Modern Text Book of Zoology : Vertebrates: Vertebrates. Meerut, 2009.
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