E. Hakami, и D. Hernandez-Leo. LAK21: 11th International Learning Analytics and Knowledge Conference, стр. 269–279. New York, NY, USA, Association for Computing Machinery, (2021)
L. Garcia-Faroldi. Social Indicators Research, 121 (3):
697-722(2015)First published online: June 13, 2014, http://dx.doi.org/10.1007/s11205-014-0671-1. (ISSP).