Crossley, S. A., Louwerse, M. M., McCarthy, P. M. & McNamara, D. S. (2007). “A Linguistic Analysis of Simplified and Authentic Texts”. The Modern Language Journal, 91 (1), 15– 30.
Crossley, S.A., Allen, D., & McNamara, D.S. (2011). Text simplification and comprehensive input: A case for intuitive approach. Language Teaching Research. 16(1), 89-108.
Ellis, R. (1994). The study of second language acquisition. Oxford: Oxford University Press.
Hill, D. (1997), “Graded (basal) readers Choosing the best”, Language Teacher, 21, 21–26.
Honeyfield, J. (1977). “Simplification”, TESOL Quarterly, 11, 431–440.
Johnson, P. (1982). “Effects on reading comprehension of building background knowledge”. TESOL Quarterly, 16, 503–516.
Kuo, C. (1993). “Problematic issues in EST materials development”. English for Specific Purposes, 12, 171– 181.
Shook, D. (1997), “Identifying and overcoming possible mismatches in the beginning reader-literary text interaction”. Hispania, 80, 234–243.
Simensen, A. M. (1987). “Adapted readers: How are they adapted?”, Reading in a Foreign Language, 4, 41– 57.
Tomlinson, B. (1998). “Comments on part A”. In B. Tomlinson (ed.), Materials development in language teaching (pp. 146–148). Cambridge: Cambridge University Press.
Vincent, M. (1983). “Writing non-fiction readers”. In R. R Jordan (Ed.), Case studies in ELT (pp. 170–178). London: Collins ELT.
Widdowson, H. G. (1978). Teaching language as communication. Oxford: Oxford University Press.
Young, D. J. (1999). “Linguistic simplification of SL reading material: Effective instructional practice?”, Modern Language Journal, 83, 350– 366.