Armstrong, A. (1957). An introduction to ancient philosophy (3. ed.). Methuen Co..
Chicago Style (17th ed.) CitationArmstrong, A.H. An Introduction to Ancient Philosophy. 3. ed. London: Methuen Co., 1957.
MLA (9th ed.) CitationArmstrong, A.H. An Introduction to Ancient Philosophy. 3. ed. Methuen Co., 1957.