An enquiry concerning the principles of morals: By David Hume, Esq;., David Hume. An enquiry concerning the principles of morals: By David Hume, Esq;. Hume, David, 1711-1776. ,253,p. ; 12⁰. London : printed for A. Millar, 1751. With a half-title, a preliminary errata leaf and three final pages of advertisements. Reproduction of original from the Harvard University Houghton Library. English Short Title Catalog, ESTCT4010. Electronic data. Farmington Hills, Mich. : Thomson Gale, 2003. Page image (PNG). Digitized image of the microfilm version produced in Woodbridge, CT by Research Publications, 1982-2002 (later known as Primary Source Microfilm, an imprint of the Gale Group).