Reisoğlu, İlknur, R. Yılmaz, M. Çoban, F. B. Topu, T. Karakuş, and Y. Göktaş. “An Examination of 3D Virtual Worlds, Design Issues, and Motivational Theory”. Pegem Journal of Education and Instruction, vol. 5, no. 3, Sept. 2015, pp. 257-72, doi:10.14527/pegegog.2015.014.