Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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