Wieland N, Kollias L. Online Learning Before, During and After COVID-19: Observations Over 20 Years. Int. J. Adv. Corp. Learn. [Internet]. 2020 Sep. 18 [cited 2024 Apr. 18];13(2):pp. 84-92. Available from: https://online-journals.org/index.php/i-jac/article/view/16779