9BEJAILANO Y' E' STEINEP,. J. "The LEVINE T' OLSHTAIN Skilled use of Interaction Strategies:Creating a Framework for Improved Small-group Communicative Interaction in the Language Classroom[J]. System(25):203-214.
10JOHNSON D' JOHNSON F. Joining Together: Group Theory and Group Skills [M].Waterloo' Ontario: Prentice-Hall International,1987.