1. Academic Ranking of World Universities. Ranking methodology of Academic Ranking of World Universities - 2017. Available from: http://www.shanghairanking.com/ARWU-Methodology-2017.html [Accessed 13th April 2018].
2. CWTS Leiden Ranking. CWTS Leiden Ranking - Information - Indicators. Available from: http://www.leidenranking.com/information/indicators [Accessed 13th April 2018].
3. URAP. World Ranking indicators. Available from: http://www.urapcenter.org/2017/methodology.php?q=3 [Accessed 13th April 2018].
4. Top Universities. QS World University Rankings – Methodology. Available from: https://www.topuniversities.com/qs-world-universityrankings/methodology [Accessed 13th April 2018].
5. Times Higher Education. World University Rankings 2018 methodology. Available from: https://www.timeshighereducation.com/worlduniversity-rankings/methodology-world-university-rankings-2018 [Accessed 13th April 2018].