Stever, H. Guyford (1972). "Science, Systems, and Society." Journal of Cybernetics, 2(3):1–3. doi:10.1080/01969727208542909
Vujakovic, Petra. (2010). "How to Measure Globalization? A New Globalization Index (NGI)." Atlantic Economic Journal,
38(2): 237. doi:10.1007/s11293-010-9217-3