Ghetie (V.). - Atlas d\'anatomie des oiseaux domestiques. Bucuresti : Editura Academiei Repblicii Socialiste România, 1976, p. 21.
https://people.ohio.edu/witmerl/1976_Ghetie_Avian_Anatomical_Atlas.pdf
Ghetie (V.). - Atlas d\'anatomie des oiseaux domestiques. Bucuresti : Editura Academiei Repblicii Socialiste România, 1976, p. 21.
https://people.ohio.edu/witmerl/1976_Ghetie_Avian_Anatomical_Atlas.pdf