1. J. J. Baumel, S. A. King, J. E. Breasile, H. E. Evans, and J. C. V. Berge , 1993 : Handbook of Avian Anatomy (Nomina Anatomica Avium) . Cambridge: Publications of the Nuttal Ornitological Club, pp. 68 , 68 -80 , 68 -80 .
2. S. Buckton , 2001 : Handbook of the Birds of the World . Cambridge: Cambridge University Press, pp. 160 -165 .
3. R. B. Chiasson , 1959 : Laboratory Anatomy of the Pigeon . Iowa: Wmc Brown Company Publishers, pp. 3 -6 .
4. T. Calislar , 1977 : Tavuk Diseksiyonu . Ankara: Firat University Press, pp. 14 -15 .