Hölterhof, T., & Rehm, M..  (2016).  Learning in Online Social Networks: Exploring Structural and Emotional Aspects of Social Presence and as a Sense of Community. In AERA 2016. gehalten auf der 04/2016, Washington D.C.: American Educational Research Association. Abgerufen von http://www.aera.net/EventsMeetings/AnnualMeeting/2016AnnualMeeting/tabid/15862/