Calvocoressi, Peter
Longman, 1991
Buku Teks
Calvocoressi, Peter
Longman, 1992
Buku Teks
Praeger Special Studies, 1883
Buku Teks
edited by John Baylis and N.J. Rengger
Clarendon Press , 1992
Buku Teks
Rourke, John T., author
McGraw-Hill, 2010
Buku Teks