de Brabander, Cornelis J., and Folke J Glastra. “Testing a Unified Model of Task-Specific Motivation: How Teachers Appraise Three Professional Development Activities”. Frontline Learning Research 6, no. 1 (June 21, 2018): 54–76. Accessed May 2, 2026. https://flr.journals.publicknowledgeproject.org/index.php/journal/article/view/342.