APA (7th ed.) Citation

Walker, E., & Elsworth, S. (2002). Grammar practice for intermediate students with key. Pearson Education Ltd..

Chicago Style (17th ed.) Citation

Walker, Elaine, and Steve Elsworth. Grammar Practice for Intermediate Students with Key. Essex: Pearson Education Ltd., 2002.

MLA (9th ed.) Citation

Walker, Elaine, and Steve Elsworth. Grammar Practice for Intermediate Students with Key. Pearson Education Ltd., 2002.