Herrick, Christopher, author
Longman, 2003
Buku Teks
Rourke, Francis E., author
John Hopkins University Press, 1972
Buku Teks
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