Das Buch der Ringsteine al-Fārābi's (gest. 950) : mit dem Kommentare des Amīr Ismāʻīl al-Ḥusainī al-Fārānī (um 1485) /

: Appeared in part as editor and translators̀ inaugural dissertation, Bonn, 1904.
The Arabic text of the Ringsteine was published in Zeitschrift für Assyriologie, volume 18, pages 257-300 ; the commentary of Emir Ismāʼil in volume 20, pages 16-48 ; "die philosophischen Ansichten" in volume 28, pages 113-146.
Title from ser. t.p. : xxviii, 510 pages : illustrations ; 24 cm.