Hirvela, Alan. "Diverse Literacy Practices among Asian Populations: Implications for Theory and Pedagogy" (Chapter 5). In: Farr, Marcia, Lisya Seloni, and Juyoung Song (editors). Ethnolinguistic Diversity and Education: Language, Literacy and Culture. Routledge, 25 January 2011. Start page 99. ISBN1135183708, 9781135183707. - Cited: p. 103. "These, too, exist as a result of efforts made by local ethnic communities. Chinese (buxiban) and Korean (hagwon) schools are the most dominant of these learning environments, while Japanese heritage schools (hoshuko) also exist in certain communities." and "[...]while the large majority (around 75 percent) of Korean schools are affiliated with churches; these began to appear in the early 1970s (Zhou & Kim, 2006)."
Kim (김), Hye-yeong (혜영) (11 de marzo de 2011). «학원, 대놓고 수업하는 곳은 없지만 10시 넘자 셔터 내리고 '보충». Hankook Ilbo(en coreano). Archivado desde el original el 19 de marzo de 2012. Consultado el 30 de marzo de 2011.
Kim (김), Hye-yeong (혜영) (11 de marzo de 2011). «학원, 대놓고 수업하는 곳은 없지만 10시 넘자 셔터 내리고 '보충». Hankook Ilbo(en coreano). Archivado desde el original el 19 de marzo de 2012. Consultado el 30 de marzo de 2011.