Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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