1. Abrami, P. C. (1989). How should we use student ratings to evaluate teaching? Research in Higher Education, 30(2), 221–227.
2. Alan, T. 2003. Reflections on student support in open and distance learning. The International Review of Research in Open and Distance Learning.
3. Bates, 1990. Media and technology in European distance education. Milton Keynes, UK: Open University.
4. Braimoh, D., & Osiki, J. O. (2008). The impact of technology on accessibility and pedagogy: the right to education in Sub-Saharan Africa.
5. Crosby, P. B. (1979). Quality is free. New York: McGraw-Hill.