Cita APA (7th ed.)

Northey, M. (1993). Impact: A guide to business communication (3rd. ed.). Prentice Hall Canada.

Cita Chicago (17th ed.)

Northey, Margot. Impact: A Guide to Business Communication. 3rd. ed. Scarborough, Ontario: Prentice Hall Canada, 1993.

Cita MLA (9th ed.)

Northey, Margot. Impact: A Guide to Business Communication. 3rd. ed. Prentice Hall Canada, 1993.