Cita APA (7a ed.)

Duffy, G. G. (1969). Teaching Linguistics. The Instructor Publications.

Cita Chicago Style (17a ed.)

Duffy, Gerald G. Teaching Linguistics. New York, Estados Unidos: The Instructor Publications, 1969.

Cita MLA (9a ed.)

Duffy, Gerald G. Teaching Linguistics. The Instructor Publications, 1969.