Saya mau tau Rujukan dari Communitas perfecta. Jelaskan dalam bahasa melayu

Böckenforde, Ernst-Wolfgang. State - Society - The Church, dalam: Writings on the State - Society - Church III, Freiburg 1990, hlm. 113-211

Graham, Robert A., SJ Vatican Diplomacy: A Study of Church and State on the International Plane (Princeton, New Jersey: Princeton University Press, 1959).

Listl, Joseph. Gereja dan Negeri dalam Undang-undang Gereja Katolik baru-baru ini, Berlin 1978