APA-referens (7:e uppl.)

Levens, A. S. (1962). Graphics, with an introduction to conceptual design. Wiley.

Chicago-referens (17:e uppl.)

Levens, Alexander Sander. Graphics, with an Introduction to Conceptual Design. New York: Wiley, 1962.

MLA-referens (9:e uppl.)

Levens, Alexander Sander. Graphics, with an Introduction to Conceptual Design. Wiley, 1962.