Schumann JHThe Acculturation Model for Second-language A Second Language Acquisition and Foreign Language Teaching 1978Samovar LA,Porter RE,Stefani LACommunication Between C 1998Hall Edward TThe Silent L 1959 Brown,RSocial P 1987Hanvey,RGCross-cultural A Toward Internationalism:Readings in Cross-cultural Awareness 1979 Adler,RSCultural Shock and the Cross-cultural Learning E Toward Internationalism:Readings in Cross-cultural Communication 1987