APA

De George, . (1971). A Guide to Philosophical Bibliography and Research. New York: Appleton.

Chicago

De George, . 1971. A Guide to Philosophical Bibliography and Research. New York: Appleton.

Harvard

De George, . (1971). A Guide to Philosophical Bibliography and Research. New York: Appleton.

MLA

De George, . A Guide to Philosophical Bibliography and Research. New York: Appleton. 1971.