Lua APA (7ú heag.)

KRASHEN, S. D., & TERRELL, T. D. (1984). The natural approach: Language acquisition in the classroom. Pergamon Press.

Lua i Stíl Chicago (17ú heag.)

KRASHEN, Stephen D., agus Tracy D. TERRELL. The Natural Approach: Language Acquisition in the Classroom. Oxford: Pergamon Press, 1984.

Lua MLA (9ú heag.)

KRASHEN, Stephen D., agus Tracy D. TERRELL. The Natural Approach: Language Acquisition in the Classroom. Pergamon Press, 1984.

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