1Hammerly, Hector. An Integrated Theory of Language Teaching and Its Practical Consequences. Blaine, Wash. : Second Language Publications. 1985.
2Walker, Gallal. In Spoken Cantonese: Context and Performance (Kaleidoscope: A Course in Intermediate to Advanced Spoken Cantonese, Volume Ⅰ). Xiaobin Jian and Mattew Christensen. Columbus: The Ohio State University Foreign Language Publications. 1994.
3Walker, Gallal. Reflecting on the Past to Shape the Future. The ACTFL Foreign Language Education Series, ed. Diane W. Birckbichler and Robert M. Terry. Lincolnwood, IL: National Textbook Co. , 2000.
