Analysis of information sources in references of the Wikipedia article "حدأة" in Arabic language version.
In 1882 appeared Dr. Reichenow's 'Die Vogel der Zoologischen Gärten', with a scheme of arrangement of birds"
{{استشهاد بكتاب}}
: صيانة الاستشهاد: مكان بدون ناشر (link)In 1882 appeared Dr. Reichenow's 'Die Vogel der Zoologischen Gärten', with a scheme of arrangement of birds"