Lewis, William Draper, author
Michie, 1937
Buku Teks
Fenn, Percy T., author
D. Appleton-Century, 1948
Buku Teks
edited Jeffrey Jowell and Dawn Oliver
Clarendon Press, 1989
Buku Teks
edited by Jeffrey Jowell and Dawn Oliver
Clarendon Press, 1994
Buku Teks
Sawer, Geoffrey, 1910-1996, author
AGPS Press, 1988
Buku Teks