Cita APA (7th ed.)

Palmer, H. E. (1968). The scientific study and teaching of languages. Oxford University Press.

Cita Chicago (17th ed.)

Palmer, Harold E. The Scientific Study and Teaching of Languages. London, England: Oxford University Press, 1968.

Cita MLA (9th ed.)

Palmer, Harold E. The Scientific Study and Teaching of Languages. Oxford University Press, 1968.