Norden, Mary
Conran Octopus Limited, 2000
Buku Referensi
Graham, Bruce Desmond
Australian National University Press, 1966
Buku Teks SO
Guild Sourcebooks, 2000
Buku Referensi
Tromp, Heimerick, compiler
Waanders, 1997
Buku Teks SO
Waller, Robert James
Warner Books, 1992
Buku Teks SO