D. Gormaz-Lobos, C. Galarce-Miranda, S. Kersten, A. Hilgarth, and H. Hortsch, “Validation of an Instrument to Measure Students’ Perceptions of Online Learning”, Int. J. Emerg. Technol. Learn., vol. 17, no. 06, pp. pp. 226–242, Mar. 2022.