edited by Andreas W. Daum, Lloyd C. Gardner, Wilfried Mausbach
Cambridge University Presss, 2003
Buku Teks
Schapiro, J. Salwyn
McGraw-Hill Book Company, Inc., 1950
Buku Teks
Calvocoressi, Peter
Longman, 1991
Buku Teks
Nau, Henry R., 1941-, author
SAGE Publications, 2019
Buku Teks
edited by John Baylis and N.J. Rengger
Clarendon Press , 1992
Buku Teks