Kotpal, R. L. (1999). The Birds: A Text Book for University Students (4th ed.). Rastogi Publications.
Chicago-čujuhus (17. p.)Kotpal, R. L. The Birds: A Text Book for University Students. 4th ed. Meerut, India: Rastogi Publications, 1999.
MLA-čujuhus (9. p.)Kotpal, R. L. The Birds: A Text Book for University Students. 4th ed. Rastogi Publications, 1999.
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