Russett, Bruce
WH Freeman, 1985
Buku Teks
Russett, Bruce, author
Wadsworth, 2010
Buku Teks
Kinsella, David Todd, author
Wadsworth, Cengage Learning, 2013
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1992
Buku Teks
Roskin, Michael G., author
Pearson/Prentice Hall, 2004
Buku Teks