Tsihouridis, Charilaos, and Marianthi Batsila. “The SiLang Simulation Tool for Business Secondary Technical Education E.S.P. Students”. International Journal of Emerging Technologies in Learning (iJET), vol. 11, no. 04, Apr. 2016, pp. pp. 61-69, doi:10.3991/ijet.v11i04.5371.