APA (7th ed.) Citation

Cooper, I. S. (1955). Theosophy simplified (6th ed.). Theosophical Press.

Chicago Style (17th ed.) Citation

Cooper, Irving S. Theosophy Simplified. 6th ed. Wheaton, Ill.: Theosophical Press, 1955.

MLA (9th ed.) Citation

Cooper, Irving S. Theosophy Simplified. 6th ed. Theosophical Press, 1955.