Carrington, Selwyn H.H., author
Foris Publications, 1988
Buku Teks
Morris, Richard B., author
Van Nostrand Reinhold, 1955
Buku Teks
Simey, T.S., author
Clarendon Press, 1946
Buku Teks
Dull, Jonathan R
Yale University Press, 1985
Buku Teks
edited by Bruce Catton
American Heritage, 1958
Buku Teks