Rousseva, Malvina. “Challenges in the Design and the Development of the Educational Serious Game ‘The Thracians’”. Digital Presentation and Preservation of Cultural and Scientific Heritage 8 (September 3, 2018): 83–86. Accessed May 3, 2024. https://dipp.math.bas.bg/dipp/article/view/dipp.2018.8.4.