1) Ram Gopal, Varsha Singh & Arun Aggarwal, Published 21 April 2021, Impact of online classes on the satisfaction and performance of students during the pandemic period of COVID 19.
2) Jasmine Paul and Felicia Jefferson, 12 November 2019, A Comparative Analysis of Student Performance in an Online vs. Face-to-Face Environmental Science Course From 2009 to 2016, https://doi.org/10.3389/fcomp.2019.00007
3) Charles Dziuban, Patsy Moskal, Jessica Thompson, Lauren Kramer, 2015, Student Satisfaction with Online Learning: Is it a Psychological Contract?, https://files.eric.ed.gov/fulltext/EJ1062943.pdf