The following selection of useful links may support your initial search for monographs, articles, and other helpful materials for your distance education research project:
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Most comprehensive compilations of resources in distance education and e-learning:
http://www.wisc.edu/depd/html/artmonth3.htm
http://www.uwex.edu/disted/index_new.htm
http://cde.athabascau.ca/resources
http://www.tonybates.ca/resources/
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http://www.col.org/resources/Pages/default.aspx
A wealth of searchable and accessible resources in open and distance learning (ODL), with a particular focus on ODL for development.
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http://sloanconsortium.org/sloanc_publications as well as http://sloanconsortium.org/effective
Sloan-C View provides accessible information about online learning from Volume 1/Issue 1 in 2002 to date. Sloan's Effective Practices site collects innovative and replicable examples of quality in online education.
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http://scholar.google.com/
Your gate to the wealth of the web...

Publicly accessible books on the theory and practice of distance education, online, and e-learning:
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http://www.mde.uni-oldenburg.de/40574.html
http://www.aupress.ca/index.php/books/120146

Learned peer-reviewed journals in the field of open and distance learning:
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- JDE, the Journal of Distance Education (Canada) at: http://www.jofde.ca/index.php/jde
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- IRRODL, the International Review of Research on Open and Distance Learning (Canada) at: http://www.irrodl.org/index.php/irrodl
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- EURODL, the European Journal of Open, Distance an E-Learning at: http://www.eurodl.org/
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- AJDE, The American Journal of Distance Education, E-Learning and Learning Online at: http://www.tandfonline.com/toc/hajd20/current
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- DE, the Australian journal on Distance Education at: http://www.tandfonline.com/toc/cdie20/current
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- Open Learning (UK) at http://www.tandfonline.com/toc/copl20/current
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- Distances et Savoir (France) at: http://ds.revuesonline.com/accueil.jsp