edited by Stephen Clarkson
The Canadian, 1968
Buku Teks
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