Yaşa, F. (2022). Review of Felicia Roșu (ed.) 2022. Slavery in the Black Sea Region, c.900–1900: Forms of Unfreedom at the Intersection between Christianity and Islam. Acta Orientalia Academiae Scientiarum Hungaricae, 75(2), 331, xxiii + 448 pp-340. https://doi.org/10.1556/062.2022.00250
Colarusso, John 1989. "Prometheus among the Circassians". In The World & I. Washington, D.C.: The Washington Times Publishing Corporation. pp. 644–651. Page 644: "The Circassians were famed throughout the Middle East for the beauty of their women and the courage of their men. Physically most Circassians are European in appearance with perhaps a slight oriental cast to their features. Many Circassians are blond and blue-eyed, while others show a common feature of the Caucasus: light skin coupled with black or extremely dark hair. A lithe and erect physique were favored, both for the men and the woman, and many villages even today have large numbers of healthy elderly people, many over a hundred years of age."