APA (7th ed.) Citation

Spaemann, R., & Armstrong, T. (1989). Basic moral concepts. Routledge.

Chicago Style (17th ed.) Citation

Spaemann, Robert, and T.J Armstrong. Basic Moral Concepts. London [etc.]: Routledge, 1989.

MLA (9th ed.) Citation

Spaemann, Robert, and T.J Armstrong. Basic Moral Concepts. Routledge, 1989.