Tohutoro APA (7th ed.)

Krashen, S. D. (1981). Second language acquisition and second language learning. Pergamon Press.

Tohutoru Kātū Chicago (17th ed.)

Krashen, Stephen D. Second Language Acquisition and Second Language Learning. Oxford: Pergamon Press, 1981.

Tohutoro MLA (9th ed.)

Krashen, Stephen D. Second Language Acquisition and Second Language Learning. Pergamon Press, 1981.