Wulansari, A. D., K. Kumaidi, and S. Hadi. “Two Parameter Logistics Model With Lognormal Response Time for Computer-Based Testing”. International Journal of Emerging Technologies in Learning (iJET), vol. 14, no. 15, Aug. 2019, pp. pp. 138-158, doi:10.3991/ijet.v14i15.10580.