Graham-Brown, Sarah
Longman, 1993
Buku Teks
Bashir, Sajitha, author
The World Bank, 2009
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