2Snow, C. E. (2010). Academic Language and the Challenge of Reading. Science, 1182597(450) , 328.
3Schleppegrell, M. J. , & Colombi, M. C. (2002). Developing advanced literacy in first and second langua- ges : Meaning with power ( pp. 1 - 20). Mahwah, N J: Lawrence Erlbanm Associates.
4Snow, C. E., Cancini, H., Gonzalez, P., &Shriberg, E. (1989). Giving formal definitions: An oral lan- guage correlate of school literacy. In D. Bloome ( Ed. ), Classrooms and literacy ( pp. 255 - 249 ). Nor- wood, NJ : Ablex.
5Snow, C. E. , & Uccelli, P. (2009). The challenge of academic language. The Cambridge handbook of literacy, 112 - 133.
6Halliday, M. A. K. (1994a). A language development approach to education. In N. Bird,et al. (Eds.), Language and learning. Papers presented at the Annual International language in Education Conference, Hong Kong, 1993.
7Bailey, A. (2007). The language demands of school: Putting academic English to the test. New Haven, CT: Yale University Press. 7 - 34.
8Halliday, M. A.K. (1994b). An introduction to functional grammar. London: Edward Arnold. 3 -25.
