1. Allen, I. E. & Seaman, J. (2015). Grade level: Tracking online education in the United States. Babson Survey Research Group. Babson College, 231 Forest Street, Babson Park, MA 02457. https://files.eric.ed.gov/fulltext/ED572778.pdf
2. Memory for goals: an activation-based model
3. Multitasking behavior in online classrooms and academic performance: case of university students in Ecuador during COVID-19 outbreak
4. Auxier, B. & Anderson, M. (2021, April 7). Social media use in 2021. Pew Research Center. https://www.pewresearch.org/internet/2021/04/07/social-media-use-in-2021/