Freeman, Joseph
Victor Gollancz, 1938
Buku Teks
Isaacs, Jennifer
Landsdowne Press, 1988
Buku Teks
Gammage, Bill, editor
Penguin Books, 1975
Buku Teks
Rolls, Eric
Nelson, 1981
Buku Teks
O`Neill, Shannan, author
Australian Education International, 2010
Buku Teks