APA-referens (7:e uppl.)

Deiss, L. (1979). The essential question. World Library Publications.

Chicago-referens (17:e uppl.)

Deiss, Lucien. The Essential Question. Chicago: World Library Publications, 1979.

MLA-referens (8:e uppl.)

Deiss, Lucien. The Essential Question. World Library Publications, 1979.