Ingpen, Robert, author
Dragon's World, 1993
Buku Referensi
McPhee, Margaret, author
Allen & Unwin, 1993
Buku Referensi
Castleden, Rodney
Chartwell Books, 2007
Buku Teks
Law, Stephen, author
Quersus, 2013
Buku Teks
Dummer, Geoffrey William Arnold, author
Pergamon Press, 1983
Buku Teks