Cita APA (7th ed.)

Krashen, S. D., & Terrell, T. D. (1988). The natural approach: Language acquisition in the classroom. Prentice Hall.

Cita Chicago (17th ed.)

Krashen, Stephen D., i Tracy D. Terrell. The Natural Approach: Language Acquisition in the Classroom. Nueva York: Prentice Hall, 1988.

Cita MLA (9th ed.)

Krashen, Stephen D., i Tracy D. Terrell. The Natural Approach: Language Acquisition in the Classroom. Prentice Hall, 1988.