The Natural Approach. Krashen, S. D and Terrell, T. D Pergamon Press, Oxford.
bibtex   
@book{krashen_natural_1983,
	Address = {Oxford},
	Author = {Krashen, Stephen D and Terrell, Tracy D},
	Date = {1983},
	Date-Modified = {2016-10-16 20:20:45 +0000},
	Keywords = {L2, L2 teaching},
	Publisher = {Pergamon Press},
	Title = {The Natural Approach}}
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