Cita APA

Willis, D., & Willis, J. (1996). Challenge and change in language teaching (1a. ed.). Oxford: Macmillan Heinemann.

Citación estilo Chicago

Willis, Dave, y Janes Willis. Challenge and Change in Language Teaching. 1a. ed. Oxford: Macmillan Heinemann, 1996.

Cita MLA

Willis, Dave, y Janes Willis. Challenge and Change in Language Teaching. 1a. ed. Oxford: Macmillan Heinemann, 1996.