APA (7th ed.) Citation

Armstrong, H. (1957). An introduction to ancient philosophy (3. ed.). Methuen.

Chicago Style (17th ed.) Citation

Armstrong, Hilary. An Introduction to Ancient Philosophy. 3. ed. London: Methuen, 1957.

MLA (9th ed.) Citation

Armstrong, Hilary. An Introduction to Ancient Philosophy. 3. ed. Methuen, 1957.

Warning: These citations may not always be 100% accurate.