Hill, Christopher, author
Palbrave Macmillan, 2003
Buku Teks
Destler, I.M., author
Brooking Institution, 1990
Buku Teks
Snyder, Richard C., author
Free Press, 1962
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1992
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1959
Buku Teks