Principles and practice in second language acquisition. Krashen, S. D Pergamon Press, Oxford.
bibtex   
@book{krashen_principles_1982,
	Address = {Oxford},
	Author = {Krashen, Stephen D},
	Date = {1982},
	Date-Modified = {2016-09-22 20:24:26 +0000},
	Keywords = {L2, L2 teaching, linguistics},
	Publisher = {Pergamon Press},
	Title = {Principles and practice in second language acquisition}}
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