6Ellis R. The Study of Second Language Acquisition[M]. Oxford: Oxford University Press, 1994.
7Brown H D. Principles of Language Learning and Teaching [ M ]. (3^rd edition). NJ: Prentice Hall Regents,1993.35.
8Krashen S. Principles and Practice in Second Language Acquisition[M]. Oxford: Pergamon Press, 1982.
9Schumann J. The Piginization Process : A Model for Second Language Acquisition[M]. Rowly, Mass. : Newbury House, 1978.
10Guion S G, J E Flege, S H Liu, & G H Yeni-Komshian. Age of learning effects on the duration of sentences produced in a second language[J]. Applied Psycholinguistics 2000, (21): 205- 228.
5Cutlip, S. M. , Center, A.H. , & Broom, G.M. (2005) . Effective Public Relations (9th Edition) . Pearson Education.
6Bandura, A. (1986) . Social foundations of thought and action. a social cognitive theory. Englewood Cliffs, NJ. Prentice Hall.
7Bissell, K. , & Collins, S. (2001) . Predictors of ability in an introductory news writing course. Journalism and Mass Communication Educator, 56 (3), pp. 67-78.
8Masse, M. H. & Popovich, M.N. (1998) . Assessing faculty attitudes toward the teaching of writing. Journalism andMass Communication Educator, 53 (3) , pp. 50-64.
9M.W. (1994) . Strategies of collaborative writing and intellectual enrichment. Journalism and Mass Communication Educatot, 48 (4), p. 48.
10Coombs, W.T. , & Rybacki, K. (1999) . Public relations education . where is pedagogy? . Public Relations Review, 25 ( 1 ), pp. 55-62.
