Goldschmidt, Arthur
Westview Press, 1983
Buku Teks
Royal Institute of International Affairs, 1954
Buku Teks
Cleveland, William L.
Westview Press , 2004
Buku Teks
Ochsenwald, William
McGraw-Hill, 2011
Buku Teks
Fisher, Sydney Nettleton
Routledge & Kegan Paul, 1959
Buku Teks