Young, Greg, author
Ashgate, 2008
Buku Teks
Elsevier, 2005
Buku Teks
Harry W. Richardson, Chang-Hee Christine Bae, Sang-Chuel Choe, editor
Edward Elgar, 2011
Buku Teks
Gould, William B., IV, author
MIT Press, 1982
Buku Teks
World Bank, 2005
Buku Teks