Jones, D.G
University of Toronto Press, 1976
Koleksi Publik
Hart, Chris, author
Sage Publications, 2007
Buku Teks
edited by Jack Davis and Robert Lecker
General Publishing, 1982
Buku Teks
Penguin, 1958
Koleksi Publik
Ross, Harris
Greenwood Press, 1987
Buku Referensi