Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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