Cornwall, John, author
Wakefield Press, 1989
Buku Teks
Murphy, Walter F., author
The John Hopkins University Press, 2007
Buku Teks
Burns, James McGregor, author
Avon Book Division, 1961
Buku Teks
Bowle, John, author
J. Cape, 1947
Buku Teks
Gray, John, author
Routledge , 1996
Buku Teks