1. Ellis, N.C. ( 1997). Vocabulary acquisition: Word structure, collocation, word-class, and meaning. In N. Schmitt & M. McCarthy (Eds.), Vocabulary and language teaching (pp. 122-39). Cambridge: Cambridge University Press.
2. Littlejohn, A. ( 1998). The analysis of language teaching materials: Inside the Trojan Horse. In B. Tomlinson (Ed.), Materials development in language teaching (pp. 190-216). Cambridge: Cambridge University Press.