A. de Almeida Ferreira, N. dos Santos, R. M. E. M. da Costa, F. A. . de A. Carneiro, and V. M. B. Werneck, “Evaluation Model of Virtual Learning Environments: A Pilot Study”, Int J Innov Educ Res, vol. 8, no. 8, pp. 610–623, Aug. 2020, doi: 10.31686/ijier.vol8.iss8.2569.