APA-Zitierstil (7. Ausg.)

(2006). 501 grammar & writing questions (3rd ed.). Learning Express.

Chicago-Zitierstil (17. Ausg.)

501 Grammar & Writing Questions. 3rd ed. New York: Learning Express, 2006.

MLA-Zitierstil (9. Ausg.)

501 Grammar & Writing Questions. 3rd ed. Learning Express, 2006.