1. Annex II Rome Ministerial Communiqué, Principles and Guidelines to Strengthen the Social Dimension of Higher Education in the EHEA, Produced by the BFUG Advisory Group 1 for Social Dimension. Edited by Co-Chairs Schmidt Scukanec Ninoslav (Croatia) and Napier Robert (ESU), 24 June 2020, 2020. Available from: http://www.ehea.info/Upload/BFUG_DE_UK_73_9_b_PaG_SD.pdf.
2. Berger, J.B., Blanco Ramírez, G. and Lyon, S., 2012. Past to present: A historical look at retention. In: A. Seidman, ed. College student retention: Formula for student success. Lanham, MD: Rowman & Littlefield, pp.7–34.
3. Bilousova, L., Kolgatin, O. and Kolgatina, L., 2019. Computer simulation as a method of learning research in computational mathematics. Ceur workshop proceedings, 2393, pp.880–894.
4. Burke, A., 2019. Student Retention Models in Higher Education: A Literature Review. College and university, 94(2), pp.12–21. Available from: https://www.aacrao.org/research-publications/quarterly-journals/college-university-journal/issue/c-u-vol.-94-no.-2-spring.
5. Demetriou, C. and Schmitz-Sciborski, A., 2011. Integration, motivation, strengths and optimism: Retention theories past, present and future. In: R. Hayes, ed. Proceedings of the 7th national symposium on student retention, 2011, charleston. Norman, OK: The University of Oklahoma, pp.300–312. Available from: http://web.archive.org/web/20130223222447/http://studentsuccess.unc.edu/files/2012/11/Demetriou-and-Schmitz-Sciborski.pdf.