1. Agasisti, T., & Johnes, G. (2015). Efficiency, costs, rankings and heterogeneity: the case of US higher education. Studies in Higher Education, 40(1), 60-82. doi: 10.1080/03075079.2013.81864410.1080/03075079.2013.818644
2. Borwick, J. (2013). Mapping the system of US higher education. HEIT Management. Retrieved from http://www.heitmanagement.com/blog/2013/09/mapping-the-system-of-us-higher-education/
3. Bourne, L., & Walker, D. H. T. (2005). Visualising and mapping stakeholder influence. Management Decision, 43(5), 649-660. doi: 10.1108/0025174051059768010.1108/00251740510597680
4. Central Statistical Bureau of Latvia. (2015). Statistical yearbook of Latvia 2014. Riga, Latvia: Central Statistical Bureau of Latvia.
5. Čiegis, R., & Zeleniūtė, R. (2008). Ekonomikos plėtra darnaus vystymosi aspektu [Economic development in the aspect of sustainable development]. Taikomoji Ekonomika: Sisteminiai Tyrimai, 2(1), 37-54.