McGraw-Hill, 1973
Buku Teks
McAvinia, Claire, author
Chandos Publishing, an imprint of Elsevie, 2016
Buku Teks
edited by Raymond J. Corsini
John Wiley & Sons, 1994
Buku Referensi
John C. Smart
Springer, 2012
eBooks
Australian.Department of Education
Australian Government Publishing Service, 1979
Buku Referensi