Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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