Vaughn SA, Orr M, Gorman N. Student’s Perceptions of Social Presence in an On-Line Course Using Student Presentation Software. Int J Innov Educ Res [Internet]. 2015 Jul. 1 [cited 2024 Dec. 23];3(7):60-7. Available from: https://scholarsjournal.net/index.php/ijier/article/view/395