Cita APA (7a ed.)

Tarone, E., & Yule, G. (1989). Focus on the language learner. Oxford University Press.

Cita Chicago Style (17a ed.)

Tarone, Elaine, y George Yule. Focus on the Language Learner. Oxford: Oxford University Press, 1989.

Cita MLA (9a ed.)

Tarone, Elaine, y George Yule. Focus on the Language Learner. Oxford University Press, 1989.