APA (7th ed.) Citation

Armstrong, A. H. (1963). An introduction to ancient philosophy. Bacon Press Boston.

Chicago Style (17th ed.) Citation

Armstrong, A. H. An Introduction to Ancient Philosophy. London: Bacon Press Boston, 1963.

MLA (9th ed.) Citation

Armstrong, A. H. An Introduction to Ancient Philosophy. Bacon Press Boston, 1963.

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