The World Bank, 2008
Buku Teks
Heneveld, Word
The World Bank , 1996
Buku Teks
Tooley, James, author
Continuum Studies Education Policy, 2000
Buku Teks
Smith, L. Glenn, author
Allyn and Bacon, 1973
Buku Teks
Williams, Gareth, author
PSI, [date of publication not identified]
Buku Teks