4EC Thach, KL Murphy.Competencies for distance education professionals[J]. Educational Technology Research and Development ,1995, 43(1):57-79.
5Williams,P. Roles and competencies for distance education programs in higher education institions[J].The American Journal of Distance Education, 2003, 17(1):45- 57.
6TM Egan, M Akdere.Clarifying Distance Education Roles and Competencies: Exploring Similarities and Differences Between Professional and Student-Practitioner Perspectives[J]. American Journal of Distance Education, 2005,19(2):87-103.
7M Thorpe.Rethinking Learner Support: The challenge of collaborativeonline learning[J].Open Learning,2002,17(2): 105-119.
8IBSTPI. The 2003 instructor competencies[DB/OL], http://www.ibstpi. org/Competencies/instruetor_competencies_2003.htm,2014-07-05.
9Dennis, B.,Watland, P.,Pirotte,S.,&Verday, N.Rolc and Competencies d the E- tuto[DB/OL], http'.//orbi.ulg,ac.be/bitstmam/2268/12722/1/DENIS WATLAND_PIROTFE_VERDAY_Roles and competencies of the tutor_30_03_2009.pdf, 2014-07-05.
10Aydin,CH.Turkish mentors,perception of roles,competencies and resources for onlie learning[J].Turkish Online Journal of Distance Education-TOJDE,2005,6(3):58-80.