5Simeon Tsetim Iber, The Principle of Subsidiarity in Catholic Social Thought. New York: Peter Lang Pub- lishing, Inc. , 2011.
6Ken Endo. "The Principle of Subsidiarity: From Johannes Althusius to Jacques Delors". Hohkaido Law Re- v/e-w, 1994, 43 (6): 553-652.
7Ad. Leys. Ecclesiological Impacts of the Principle of Subsidiarity. Kampen: Uitgeverij Kok, 1995.
8Wilhelm Emmanuel von Ketteler. The Social Teaching of Wilhelm Emmanuel yon Ketteler, Bishop of Mainz (1811-1877) . Washington D. C. : University Press of America, 1981.
9John C. Fuseo. Autonomy, Subsidiarity and the Religious University. A Dissertation Prented to the Fac- ulty of the Graduate School of Saint Louis University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy, 2003.