Krashen, S. D. (1991). Writing: Research, theory, and applications. Laredo Pub.
Lua i Stíl Chicago (17ú heag.)Krashen, Stephen D. Writing: Research, Theory, and Applications. Torrance, Calif: Laredo Pub, 1991.
Lua MLA (9ú heag.)Krashen, Stephen D. Writing: Research, Theory, and Applications. Laredo Pub, 1991.
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