00438nam a2200109Ia 4500008004100000100002600041245013100067260003000198300001800228650001400246856006800260160712s9999    xx            000 0 und d  aPitagan, Ferdinand B.  cFerdinand B. PitaganaInteraction Effects and Cognitive Engagements of Collaborative Groups in Online Asynchronous Discussions  c2013bEducation Quarterly  avol. 71 no. 2  xEDUCATION  uhttp://journals.upd.edu.ph/index.php/edq/article/view/3880/3538