Cita APA (7a ed.)

Helling, P. (1992). The grammar and proofreading course. American Management Association.

Cita Chicago Style (17a ed.)

Helling, Pamela. The Grammar and Proofreading Course. [Place of publication not identified]: American Management Association, 1992.

Cita MLA (8a ed.)

Helling, Pamela. The Grammar and Proofreading Course. American Management Association, 1992.