Cita APA

Richards, J. C. 1., & Richards, J. C. 1. (1998). Interchange: Intro : video activity book. Cambridge: Cambridge University Press.

Citación estilo Chicago

Richards, Jack C. 1943-, y Jack C. 1943- Richards. Interchange: Intro : Video Activity Book. Cambridge: Cambridge University Press, 1998.

Cita MLA

Richards, Jack C. 1943-, y Jack C. 1943- Richards. Interchange: Intro : Video Activity Book. Cambridge: Cambridge University Press, 1998.