Tooley, James
Continuum Studies Education Policy, 2000
Buku Teks
Smith, L. Glenn
Allyn and Bacon, 1973
Buku Teks
Williams, Gareth
PSI, [date of publication not identified]
Buku Teks
Allyn and Bacon, 1991
Buku Teks
The officer of Education Research and Development Ministry of National Education,
Majalah, Jurnal, Buletin