Offir, B., Bezalel-Rosenblatt, R., & Barth, I. (2007).
Introverts, extroverts, and achievement in a distance learning environment . The American Journal of Distance Education, 21 (1), 3-19.
Offir, B. (2006).
Influence of distance education environment on university students' attribution of success and failure factors. Computers in Education Journal, 16 (1), 82-94.