Kinnane, Garry
Nelson, 1986
Buku Teks
edited by Leslie Stephen, Sidney Lee
Oxford University Press, 1950
Buku Referensi
Terry, George Robert
Richard D. Irwin, 1978
Buku Teks
Meyer, Robert R
Twayne's, 1966
Buku Teks
Price, George R.
Twayne , 1969
Buku Teks