The International Political Science Association, 2009
Buku Referensi
Ebenstein, William, author
Thomson Wadsworth, 2002
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
W. Van Hoeve, 1954
Buku Teks
Rush, Michael, author
Harvester Wheatsheaf, 1992
Buku Teks
Roelofs, H. Mark
The Dorsey press, 1968
Buku Teks