@book{36537,
	author = {Weiss, Joel. and Nolan, Jason. and SpringerLink (Online service)},
	title = {The International Handbook of Virtual Learning Environments},
	publisher = {Springer Netherlands,},
	year = {2006.},
	address = {Dordrecht :},
	url = {http://dx.doi.org/10.1007/978-1-4020-3803-7}
}