1. Jervis,P., (2004). Adult education and life long learning: Theory and practice, Routledge Flamer Tayler & Francis group London and New York.
2. Mehrotra,C.M.,Hollister,C.D&McGahey,L. (2001). Distance learning: Principles for effective design, delivery and evaluation. Thousand oaks, C A: Sage publications.
3. Moor and Kearsely (2005). Distance Education System.2nd Edition, California: Wadswort publications.
4. Moor,M.G., (2005). Blending learning: American Journal of Education. Vol.19.
5. Choudhry,A., Gujjar,A,A,.& Hafeez,M,R, .(2008). Comparative study of student support services of AIOU and UKOU, Turkish online Journal of Distance Education, Anodolu University, Eskisher, Turkey, Vol.9 No: 1.