APA-referens (7:e uppl.)

Delfgaauw, B. (1969). Twentieth-century philosophy. Magi Books.

Chicago-referens (17:e uppl.)

Delfgaauw, Bernard. Twentieth-century Philosophy. Albany, N.Y.: Magi Books, 1969.

MLA-referens (8:e uppl.)

Delfgaauw, Bernard. Twentieth-century Philosophy. Magi Books, 1969.