@book{122906,
	author = {Clark, Ruth Colvin. and Mayer, Richard E., and ebrary, Inc.},
	title = {E-learning and the science of instruction},
	publisher = {Pfeiffer,},
	year = {2011.},
	series = {Essential resources for training and HR professionals},
	address = {San Francisco, Calif. :},
	edition = {3rd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10488509}
}