Bates, A.W (1995). Technology, Open Learning and Distance Education. Routledge, London and New York, Chapter 1.

Media Selection Matrix - http://www.outreach.psu.edu/de/id&D/media_selection_matrix.html

13 things to consider when selecting media - http://www.coe.missouri.edu/~tile2003/teacher/media%20selection/13things.html