Luard, Evan
St. Martin`s Press, 1992
Buku Teks
Watson, Adam
Routledge, 1992
Buku Teks
Lewis, William Arthur, 1915-
Princeton University Press, 1978
Buku Teks
Nau, Henry R., 1941-
SAGE Publications, 2019
Buku Teks
edited by George T. Crane and Abla Amawi
Oxford University Press, 1997
Buku Teks