APA (7e ed.) Bronvermelding

Azar, B. S., & Hagen, S. A. (2009). Understanding and using english grammar (4th ed.). Pearson.

Chicago (17e ed.) Bronvermelding

Azar, Betty S., en Stacy A. Hagen. Understanding and Using English Grammar. 4th ed. New York: Pearson, 2009.

MLA (9e ed.) Bronvermelding

Azar, Betty S., en Stacy A. Hagen. Understanding and Using English Grammar. 4th ed. Pearson, 2009.