Lehan, Tara, Heather Hussey, and Tom Hotz. “ Factors Associated With Online Doctoral Student Persistence: A Critical Integrative Review of the Literature”. Current Issues in Education 22, no. 2 (May 18, 2021). Accessed November 26, 2024. https://cie.asu.edu/ojs/index.php/cieatasu/article/view/1961.