@article{Spencer_2003, title={Handbook of Distance Education}, volume={4}, url={https://www.irrodl.org/index.php/irrodl/article/view/143}, DOI={10.19173/irrodl.v4i2.143}, number={2}, journal={The International Review of Research in Open and Distributed Learning}, author={Spencer, Robert}, year={2003}, month={Oct.} }