Plotinus. The six Enneads. Translated by Stephen MacKenna and B. S. Page. - Chicago, Encyclopaedia Britannica [1955, c1952] - Great books of the Western World, v. 17 . LCCN: 55010326 //r863 LC Class. No.: AC1 / .G72 vol. 17 Dewey Class. No.: 186.4