1. Garrison, S. W. (2010). A rational approach to developing and assessing the construct validity of a student learning style scales instrument. The Journal of Psychology, 87(2), 213-223.
2. Kreijns, K., Kirschner, P. A., Jochems, W., & Van Buuren, H. (2007). Measuring perceived sociability of computer-supported collaborative learning environments. Computers & Education, 49(2), 176-192.
3. Lee, E., & Akcaoglu, M. (2017). Sociability of Online Learning Environments: Examining Discussion Group Sizes and Social Network Sites. Learning, Design, And Technology, 1-16.
4. Poquet, O., Kovanović, V., de Vries, P., Hennis, T., Joksimović, S., Gašević, D., & Dawson, S. (2018). Social presence in massive open online 60 courses. International Review of Research in Open and Distributed Learning, 19(3).
5. Richardson, J. C., Maeda, Y., Lv, J., & Caskurlu, S. (2017). Social presence in relation to students' satisfaction and learning in the online environment: A meta-analysis. Computers in Human Behavior, 71, 402-417.
6. Short W., & Grasha, A. F. (1976). A rational approach to developing and assessing the construct validity of a student learning style scales instrument. The Journal of Psychology, 87(2), 213-223.
7. Wang, C., Fang, T., & Miao, R. (2018). Learning performance and cognitive load in mobile learning: Impact of interaction complexity. Journal of Computer Assisted Learning, 34(6), 917-927.