Kotpal, R. L. (2009). Modern text book of zoology : vertebrates: Vertebrates. Meerut.
Chicago-čujuhus (17. p.)Kotpal, R. L. Modern Text Book of Zoology : Vertebrates: Vertebrates. Rastogi Publications: Meerut, 2009.
MLA-čujuhus (9. p.)Kotpal, R. L. Modern Text Book of Zoology : Vertebrates: Vertebrates. Meerut, 2009.
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