Cita APA (7th ed.)
Krashen Stephen D. (1988). Second language acquisition and second language learning. Prentice-Hall.
Cita Chicago (17th ed.)
Krashen Stephen D. Second Language Acquisition and Second Language Learning. New York: Prentice-Hall, 1988.
Cita MLA (9th ed.)
Krashen Stephen D. Second Language Acquisition and Second Language Learning. Prentice-Hall, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.