Levine, Daniel U.
Allyn and Bacon, 1992
Buku Teks
Allyn and Bacon, 1991
Buku Teks
Hongkong : City University of Hongkong, 2007,
Majalah, Jurnal, Buletin
Tooley, James
Continuum Studies Education Policy, 2000
Buku Teks
Brereton, Pat
Continuum, 2005
Buku Teks