East, Roger, author
Pinter Publishers, 1997
Buku Teks
edited by Regina Cowen Karp
Oxford University Press, 1993
Buku Teks
Garrett, James M., author
Westview Press, 1989
Buku Teks
Robbins, Peter T., editor
Springer, 2011
eBooks
Hertzman, Clyde
DC The International Bank for Reconstruction and Development , 1995
Buku Teks