Davis, Fanny, The Palace of Topkapi in Istanbul, Scribner, 1970, pp. 227–228, OCLC 636864790.
«Kosem was said to have been the daughter of a Greek priest of one of the Aegean islands, probably captured during one of the Ottoman-Venetian maritime campaigns. Her name was Anastasia but was changed after her conversion, no doubt on her admission to the palace, to Mâh-Peyker (Moon-Shaped), and later by Sultan Ahmet to Kosem»