Ref Taylor

Krashen, S. (1981). Second language acquisition and second language learning.  Oxford: Pergamon.
Krashen, S. (1982). Principles and practice in second language acquisition. Oxford: Pergamon.
Krashen, S. (2013). The case for non-targeted, comprehensible input. Journal of bilingual education research & instruction, 15(1): 102-110.
Pinker, S. (1994). The Language Instinct. New York: HarperCollins.