Handbook of the birds of Europe the Middle East and North Africa : the birds of the Western Palearctic; Volume 7
edited by Stanley Cramp, C.M. Perrins
Oxford University Press, 1993
 Buku Referensi
Handbook of Australian, New Zealand & Antarctic birds : volume 2, raptors to lapwings
edited by S. Marchant, P.J. Higgins
Oxford University Press, 1993
 Buku Referensi
Hormones and reproduction of vertebrates; Volume 4 : Birds
edited by David O. Norris, Kristin H. Lopez
Elsevier, 2011
 Buku Referensi
Audubon, John James, author
The birds of America
Macmillan, 1985
 Buku Referensi
The encyclopaedia of birds
edited by Christopher M. Perrins and Alex L.A. Middleton
Grolier International, 1993
 Buku Referensi
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