APA (7th ed.) Citation

Duncan, E. H. (1979). Sören Kierkegaard (3. print.). Word Books.

Chicago Style (17th ed.) Citation

Duncan, Elmer H. Sören Kierkegaard. 3. print. Waco, Tex: Word Books, 1979.

MLA (9th ed.) Citation

Duncan, Elmer H. Sören Kierkegaard. 3. print. Word Books, 1979.