@book{297269,
	author = {Pitagan, Ferdinand B.},
	title = {Interaction Effects and Cognitive Engagements of Collaborative Groups in Online Asynchronous Discussions},
	publisher = {Education Quarterly},
	year = {2013},
	url = {http://journals.upd.edu.ph/index.php/edq/article/view/3880/3538}
}