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Student Perceptions of the Instructor's Relational Characteristics, the Classroom Communication Experience, and the Interaction Involvement in Face-to-Face versus Video Conference Instruction[J] . Laura R. Umphrey,Jeffrey A. Wickersham,John C. Sherblom.Communication Research Reports . 2008 (2)
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Critical thinking, cognitive presence, and computer conferencing in distance education[J] . D. Randy Garrison,Terry Anderson,Walter Archer.American Journal of Distance Education . 2001 (1)