Newby, Eric, author
Picador, 1989
Buku Teks
Lanterbach, Richard E.
: Harper & Brothers,, 1947.
Buku Teks
Elvin, Harold
Macmillan, 1957
Buku Teks
Payne, Robert
William Heinemann, 1947
Buku Teks
Gale, George Stafford, author
Allen & Unwin, 1955
Buku Teks