Indiaka, Sheilla, Waweru Mwangi, and Jael Sanyanda. “Effectiveness of Digital Gamification in Biology Concept Comprehension and Learner Motivation in Secondary Schools”. Journal of Learning for Development 12, no. 3 (November 18, 2025): 519–530. Accessed April 27, 2026. https://jl4d.org/index.php/ejl4d/article/view/1595.