2 - Examining Barriers to Distance Education - Simonson (2001)
1 - Barriers to Distance Education - Muilenberg & Berge (2001)
4 - Barriers to Distance Education and Training - Berge, Muilenberge & Van Haneghan (2002)
5 - Barriers to Learning in Distance Education - Galusha
Avaluo Institucional PUCPR 2012