De Santis, Annamaria, Katia Sannicandro, Claudia Bellini, and Tommaso Minerva. 2024. “Trends in the Use of Multivariate Analysis 
in Educational Research: A Review of Methods and Applications 
in 2018-2022”. Journal of E-Learning and Knowledge Society 20 (1), 47-55. https://doi.org/10.20368/1971-8829/1135946.