5Kellerman. E. New Uses for Old Language: Cross--linguistic and Cross--gestural Influence in the Narratives of non--native speakers. [J]. In J. Cenoz, B. Hufeisen and U. Jessner, eds. 2001.
6Schumann, J. 'The Acculturation Model for Second Language Acquisition in R Gingras (ed.) [C]. Second anguage's Acqui- sition and Foreign Language Teaching. Artington, VA.: Center for Applied Linguistics, 1978c.