Krashen, S. (1982). Principles and practice in second language acquisition. Oxford: Pergamon Press "Archived copy". Archived from the original on July 16, 2011. Retrieved November 25, 2010.{{cite web}}: CS1 maint: archived copy as title (link)
Schutz, R. (2007). "Stephen Krashen's Theory of Second Language Acquisition." English Made in Brazil. Available from [1]Archived November 22, 2017, at the Wayback Machine
Schutz, R. (2007). "Stephen Krashen's Theory of Second Language Acquisition." English Made in Brazil. Available from [1]Archived November 22, 2017, at the Wayback Machine
Krashen, S. (1982). Principles and practice in second language acquisition. Oxford: Pergamon Press "Archived copy". Archived from the original on July 16, 2011. Retrieved November 25, 2010.{{cite web}}: CS1 maint: archived copy as title (link)
Krashen, Stephen (1977). "Some issues relating to the monitor model". In Brown, H; Yorio, Carlos; Crymes, Ruth (eds.). Teaching and learning English as a Second Language: Trends in Research and Practice: On TESOL '77: Selected Papers from the Eleventh Annual Convention of Teachers of English to Speakers of Other Languages, Miami, Florida, April 26 – May 1, 1977. Washington, DC: Teachers of English to Speakers of Other Languages. pp. 144–158. OCLC4037133.
