Gilmore, Gene, author
The Glindersany, 1971
Buku Teks
Baskette, Floyd K., author
Macmillan, 1982
Buku Teks
Morrish, John, author
Routledge, 1996
Buku Teks
Gilmore, Gene, author
Body & Fraser Publishing Company, 1997
Buku Teks
Sharpe, Leslie T., author
Camberidge University Press , 1994
Buku Teks