APA-referens (7:e uppl.)

Liles, P., Brendel, L. A., & Krause, R. (1960). Typing mailable letters: Practice projects in placement, punctuation, proofreading, and production. Gregg Pub. Division, McGraw-Hill.

Chicago-referens (17:e uppl.)

Liles, Parker, Leroy A. Brendel, och Ruthetta Krause. Typing Mailable Letters: Practice Projects in Placement, Punctuation, Proofreading, and Production. New York: Gregg Pub. Division, McGraw-Hill, 1960.

MLA-referens (8:e uppl.)

Liles, Parker, et al. Typing Mailable Letters: Practice Projects in Placement, Punctuation, Proofreading, and Production. Gregg Pub. Division, McGraw-Hill, 1960.