@book{52424,
	title = {Learning and instructional technologies for the 21st century :},
	publisher = {Springer,},
	year = {2009.},
	address = {New York  :},
	edition = {1st ed.},
	url = {http://er.library.ums.ac.id/Pendidikan/ohio/Learning_and_Instructional_Technologies_for_the_21st_Century__Visions_of_the_Future.pdf}
}