Calvocoressi, Peter
Longman, 1992
Buku Teks
Calvocoressi, Peter
Longman, 1991
Buku Teks
edited by John Baylis and N.J. Rengger
Clarendon Press , 1992
Buku Teks
edited Steven L. Spiegel
St. Martin's Press, 1981
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Vorkonk-Van Hoeve, 1976
Buku Teks