1. Cambridge Dictionary. (2018). English Dictionary. Cambridge University Press. Retrieved June 14, 2018, from https://dictionary.cambridge.org/dictionary/english/
2. Chua, Y.T. (2010). Kachru's three circles of English. Wikimedia Commons, Retrieved June 14, 2018, from https://commons.wikimedia.org/wiki/File:Kachru%27s_three_circles_of_English.jpg/
3. Endarto, I. T. (2016). World Englishes: Redefining our pedagogical perspective. The 3rd International Language and Language Teaching Conference, pp. 92-97. Yogyakarta: Sanata Dharma University.
4. Gilquin, G. & Granger, S. (2011). From EFL to ESL: Evidence from the international corpus of learner English. In M. Hundt & D. Mukherjee, (Eds.). Exploring Second-Language Varieties of English and Learner Englishes: Bridging a Paradigm Gap (pp. 57-80). Amsterdam & Philadelphia: Benjamins.
5. Kachru, B. (1992). The Other Tongue: English across Cultures. Illinois: University of Illinois Press. Kachru, Y. &
6. Nelson, C. L. (2006). World Englishes in Asian Contexts. Hong Kong: Hong Kong University Press.
7. Kirkpatrick, A. (2012). English as an international language in Asia: Implications for language education. In A. Kirkpatrick and R. Sussex (Eds). English as an International Language in Asia: Implications for Language Education (pp. 29-44). New York: Springer.
8. Kirkpatrick, A. & Sussex, R. (2012). Introduction. In A. Kirkpatrick and R. Sussex (Eds). English as an International Language in Asia: Implications for Language Education (pp. 1-12). New York: Springer.
9. Lie, A. (2007). Education policy and EFL curriculum in Indonesia: Between the commitment to competence and the quest for higher test scores. TEFLIN Journal, Vol. 18(1), pp. 1-14.
10. Suharjati, F. (2010). History of teaching English as a foreign language in Indonesia. Deiksis, Vol. 2(3), pp. 161-168. World Population Review. (2018). Indonesia population. Retrieved June 15, 2018, from http://worldpopulationreview.com/countries/indonesia/