Artikel Jurnal
Hardy, Charles O., author
Brookings Institution, 1940
Buku Teks
Wherry, Frederick F., author
Polity Press, 2012
Buku Teks
Cochrane, Willard W., author
University of Minnesota Press, 1964
Buku Teks
Fadillah Meisy Fitriyandi, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)