Colarik, Andrew M, author
IDEA Group, 2006
Buku Teks
Institute for Public Policy Studies , 1992
Buku Teks
Lee, Albert J., author
[Springer, Springer], 2012
eBooks
Rosinger, Lawrence K., author
Macmillan, 1950
Buku Teks
Senelle, Robert
Ministry of Foreign Affairs and External Trade , 1979
Buku Teks