Cita APA (7a ed.)

Walker, E., & Elswortk, S. (2000). New grammar practice for pre-intermediate students with key. Pearson Education.

Cita Chicago Style (17a ed.)

Walker, Elaine, y Steve Elswortk. New Grammar Practice for Pre-intermediate Students with Key. England: Pearson Education, 2000.

Cita MLA (8a ed.)

Walker, Elaine, y Steve Elswortk. New Grammar Practice for Pre-intermediate Students with Key. Pearson Education, 2000.

Precaución: Estas citas no son 100% exactas.