5Ausubel & Robinson ( 1971 ). School Learning: An Introduction to Educational Psychology[ M ]. London : Holt, Rinehart and Winston.
6Lockwood, F. (1992). Activities in Self-instructional Texts[ M], London: Kogan Page,1992.
7Mishra, S. & Gaba, K. (2001). Learning Activities in IGNOU Study Materials [ DB/OL ]. http://www. col. org/resources/startupguides/odlinstdesignHB. pdf
8Ramanujam, P. R. ( 1993 ). Distance Learning Materials of the Developing Countries: How About Quality? [ J ]. Indian Journal of Open Learning, 1993, 2 (2).
9Rowntree, D. (1990). Teaching through Self-instrnction: How to Develop Open Learning[ M]. London: Kogan Page, 1990.
10The commonwealth of learning ( 2004 ). Planning and Implementing Open and Distance Learning Systems : A Handbook for Decision Makers [ DB/OL ]. Retriceved at http ://col. int/resources/startupguides/odlplanningHB. pdf
