Ibn-Gabirol, S. B.-Y. (~ 1901). The improvement of the moral qualities : an ethical treatise of the eleventh century by Solomon Ibn Gabirol [Book]. בתוך S. S. Wise (בעריכת), Columbia University oriental studies. The Columbia University Press.

Ibn-Gabirol, Shelomoh Ben-Yehudah. 1901. The improvement of the moral qualities : an ethical treatise of the eleventh century by Solomon Ibn Gabirol. Book. נערך ע"י Stephen S. Wise. Columbia University oriental studies. Columbia University oriental studies 1. New York: The Columbia University Press.

Ibn-Gabirol SB-Y (1901) The improvement of the moral qualities : an ethical treatise of the eleventh century by Solomon Ibn Gabirol. The Columbia University Press, New York

1.Ibn-Gabirol, S.B.-Y.: The improvement of the moral qualities : an ethical treatise of the eleventh century by Solomon Ibn Gabirol. The Columbia University Press, New York (1901).

Ibn-Gabirol, Shelomoh Ben-Yehudah ; Wise, S. S. (בעריכת) ; ; : The improvement of the moral qualities : an ethical treatise of the eleventh century by Solomon Ibn Gabirol, Columbia University oriental studies. book. New York : The Columbia University Press, 1901