Cita APA (7a ed.)

Allen, E. D., & Valette, R. M. (1977). Classroom techniques, foreign languages and English as a second language. Harcourt Brace Jovanovich.

Cita Chicago Style (17a ed.)

Allen, Edward David, y Rebecca M. Valette. Classroom Techniques, Foreign Languages and English as a Second Language. New York [etc.]: Harcourt Brace Jovanovich, 1977.

Cita MLA (9a ed.)

Allen, Edward David, y Rebecca M. Valette. Classroom Techniques, Foreign Languages and English as a Second Language. Harcourt Brace Jovanovich, 1977.