Cita APA (7th ed.)
Krashen, S. D. (1984). Writing: Research, theory and applications. Pergamon Inst. of English.
Cita Chicago (17th ed.)
Krashen, Stephen D. Writing: Research, Theory and Applications. Oxford [usw.], Frankfurt: Pergamon Inst. of English, 1984.
Cita MLA (9th ed.)
Krashen, Stephen D. Writing: Research, Theory and Applications. Pergamon Inst. of English, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.