1. Adkins, S. S. (2015). The 2015–2020 China digital English language learning market. Ambient Insight. Available online at http://www.ambientinsight.com/Resources/Documents/AmbientInsight_2015-2020_China_Digital_English_Market_Abstract.pdf
2. British Council. (2006). A review of the global market for English language courses. Available online at https://www.britishcouncil.org/sites/default/files/a-review-of-the-global-market-for-english-language-courses.pdf
3. Campbell, A. P. (2004). Using LiveJournal for authentic communication in EFL classes. Internet TESL Journal, 10(9). Available online at http://iteslj.org/Techniques/Campbell-LiveJournal/
4. Ellis, R. (1994). The study of second language acquisition. Oxford, U.K.: Oxford University Press.
5. Hadzantonis, D. M. (2013). English-language pedagogies for a Northeast Asian context: Developing and contextually framing the transition theory. New York: Routledge.