Harper, J. Russell.
University of Toronto Press , 1966
Buku Teks
Lord, Barry, author
NC Press, 1974
Buku Teks
Read, Herbert Edward, Sir, author
Praeger , 1959
Buku Teks
Masters, Donald C., author
D. Van Nostrand, 1958
Buku Teks
Creighton, Donald, author
Macmillan, 1977
Buku Teks