Osmond, Warren G.
Allen and Unwin, 1985
Buku Teks
Kelly, Paul, author
Angus and Robertson , 1985
Buku Teks
University of queensland press,
Majalah, Jurnal, Buletin
edited by Henry Mayer
F.W. Chesire, 1966
Buku Teks
edited by Henry Mayer and Helen Nelson
Cheshire, 1973
Buku Teks