Liles, P., Brendel, L. A., & Krause, R. (1960). Typing mailable letters: Practice projects in placement, punctuation, proofreading, and production. Gregg Pub. Division, McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Liles, Parker, Leroy A. Brendel, agus Ruthetta Krause. Typing Mailable Letters: Practice Projects in Placement, Punctuation, Proofreading, and Production. New York: Gregg Pub. Division, McGraw-Hill, 1960.
Lua MLA (8ú heag.)Liles, Parker, et al. Typing Mailable Letters: Practice Projects in Placement, Punctuation, Proofreading, and Production. Gregg Pub. Division, McGraw-Hill, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.