Australian Government Publishing Service , 1986
Buku Teks
Wright, Katherine, author
Geddes & Grosset, 2004
Buku Teks
Hughes, Rebecca, contributing writher; Chasnoff, Ira J., consultan; Ellis, Jeffrey W., consultan; Fainman, Zachary S., consultan; McDermott, Teri J., consultan
Publications International , 1991
Buku Referensi
Williams, Norma
Tiger Books International, 1990
Buku Referensi
Carlson, Karen J., author
Harvard University Press, 1997
Buku Teks