Marciniak, Renata. “Quality Assurance for Online Higher Education Programmes: Design and Validation of an Integrative Assessment Model Applicable to Spanish Universities”. The International Review of Research in Open and Distributed Learning 19, no. 2 (May 1, 2018). Accessed October 18, 2019. http://www.irrodl.org/index.php/irrodl/article/view/3443.