Cita APA (7a ed.)

Armstrong, A. H. (1972). An introduction to ancient philosophy. Methuen.

Cita Chicago Style (17a ed.)

Armstrong, Arthur Hilary. An Introduction to Ancient Philosophy. London: Methuen, 1972.

Cita MLA (9a ed.)

Armstrong, Arthur Hilary. An Introduction to Ancient Philosophy. Methuen, 1972.