APA (7e ed.) Bronvermelding

Levens, A. S. (1968). Graphics, analysis and conceptual design (2d ed.). Wiley.

Chicago (17e ed.) Bronvermelding

Levens, A. S. Graphics, Analysis and Conceptual Design. 2d ed. New York: Wiley, 1968.

MLA (8e ed.) Bronvermelding

Levens, A. S. Graphics, Analysis and Conceptual Design. 2d ed. Wiley, 1968.