APA (7th ed.) Citation

Hume, D. (1998). An enquiry concerning the principles of morals. Univ. Pr.

Chicago Style (17th ed.) Citation

Hume, David. An Enquiry Concerning the Principles of Morals. Oxford: Univ. Pr, 1998.

MLA (9th ed.) Citation

Hume, David. An Enquiry Concerning the Principles of Morals. Univ. Pr, 1998.