Enquiries concerning the human understanding, and [An enquiry] concerning the principles of morals, by David Hume.
Reprinted from the posthumous edition of 1777, and ed., with an introduction, comparative tables of contents, and an analytical index, by L. A. Selby-Bigge.

APA Citation

Hume, D., Selby-Bigge, L. A. (Lewis Amherst). (1961). Enquiries concerning the human understanding, and [An enquiry] concerning the principles of morals, by David Hume. Oxford: Clarendon press.

MLA Citation

Hume, David, 1711-1776, and L. A. (Lewis Amherst) Selby-Bigge. Enquiries Concerning the Human Understanding, And [An Enquiry] Concerning the Principles of Morals, by David Hume. Oxford: Clarendon press, 1961.

Warning: These citations may not always be complete (especially for serials).