APA (7e ed.) Bronvermelding
Helling, P. (1992). The grammar and proofreading course. American Management Association.
Chicago (17e ed.) Bronvermelding
Helling, Pam. The Grammar and Proofreading Course. [Saranac Lake, N.Y.]: American Management Association, 1992.
MLA (9e ed.) Bronvermelding
Helling, Pam. The Grammar and Proofreading Course. American Management Association, 1992.
Let op: Deze citaties zijn niet altijd 100% accuraat.