Cita APA (7th ed.)

Krashen, S. D., & Terrell, T. D. (1983). The natural approach: Language acquisition in the classroom. Alemany Press.

Cita Chicago (17th ed.)

Krashen, Stephen D., i Tracy D. Terrell. The Natural Approach: Language Acquisition in the Classroom. Hayward: Alemany Press, 1983.

Cita MLA (9th ed.)

Krashen, Stephen D., i Tracy D. Terrell. The Natural Approach: Language Acquisition in the Classroom. Alemany Press, 1983.