1. Burrell, Q. L., “The 80-20 rule: Library lore or statistical law?” Journal of Documentation 41 (1985), 24–39.
2. The History of Economic Thought Website, http://homepage.newschool.edu/het (click on Alphabetical Index and then on Pareto).
3. Juran, Joseph M., “Universals in management planning and controlling”, Management Review, 43(11) (1954), 748–761.
4. Koch, Richard, The 80/20 Principle: The Secret of Achieving More With Less, Doubleday, New York, 1998.
5. Pareto, Vilfredo, Cours d’Économie Politique: Nouvelle Édition par G.-H. Bousquet et G. Busino, Librairie Droz, Geneva, 1964.