Goldschmidt, Arthur
Westview Press, 1983
Buku Teks
Ochsenwald, William
McGraw-Hill, 2011
Buku Teks
edited by Peter Mansfield
Oxford University Press, 1973]
Buku Teks
Royal Institute of International Affairs, 1954
Buku Teks
Fisher, Sydney Nettleton
Routledge & Kegan Paul, 1959
Buku Teks