APA-Zitierstil (7. Ausg.)

Walker, E., & Elsworth, S. (2000). Grammar practice for upper intermediate students: With key (new ed.). Longman.

Chicago-Zitierstil (17. Ausg.)

Walker, Elaine, und Steve Elsworth. Grammar Practice for Upper Intermediate Students: With Key. new ed. Essex: Longman, 2000.

MLA-Zitierstil (9. Ausg.)

Walker, Elaine, und Steve Elsworth. Grammar Practice for Upper Intermediate Students: With Key. new ed. Longman, 2000.