6Tomlinson Brian. Material Development [A]. In R Carter, D Nunan (Eels.). The Cambridge Guide to Teaching English to Speakers of Other Languages [C]. Cambridge: Cambridge University Press, 2001.
7Palmer H E. The Principles of Language Study [M]. Oxford.. Oxford University Press, 1968.
8Richards J C. Curriculum Development in Language Teaching [M]. Cambridge: Cambridge University Press, 2001.
9Tomlinson Brian. Introduction [A]. In B Tomlinson ( Eds. ). Materials Development in Language Teaching [C]. Cambridge.. Cambridge University Press, 1998.
10Widdowson H G. Explorations in Applied Linguistics [M]. Oxford: Oxford University Press, 1984.
