Cita APA (7a ed.)

Oller, J. W., & Richards, J. C. (1973). Focus on the learner: Pragmatic perspectives for the language teacher. Newbury House Publishers.

Cita Chicago Style (17a ed.)

Oller, John W., y Jack C. Richards. Focus on the Learner: Pragmatic Perspectives for the Language Teacher. Rowley, Mass: Newbury House Publishers, 1973.

Cita MLA (9a ed.)

Oller, John W., y Jack C. Richards. Focus on the Learner: Pragmatic Perspectives for the Language Teacher. Newbury House Publishers, 1973.