Cita APA (7th ed.)

Politzer, R. L. (1970). Foreign language learning, a linguistic introduction. Prentice-Hall.

Cita Chicago (17th ed.)

Politzer, Robert Louis. Foreign Language Learning, a Linguistic Introduction. Englewood Cliffs, N. J: Prentice-Hall, 1970.

Cita MLA (9th ed.)

Politzer, Robert Louis. Foreign Language Learning, a Linguistic Introduction. Prentice-Hall, 1970.