Hillenbrand, Laura, author
Ballantine Books, 2001
Buku Teks
Kelen, Betty, author
Graham Brash, 1990
Buku Teks
Moncrieff, A.R. Hope, author
Gramercy, 1995
Buku Referensi
Gilbert, Kevin, author
Queensland University, 1978
Buku Teks
Reed, A.W.
Heinemann Reed, 1989
Buku Teks