Kelly, Alfred H., author
W.W. Norton, 1983
Buku Teks
Lefebvre, Georges, author
Routledge, 2001
Buku Teks
Dull, Jonathan R
Yale University Press, 1985
Buku Teks
edited by Bruce Catton
American Heritage, 1958
Buku Teks
Gagey, Edmond M., author
Columbia University Press, 1948
Buku Teks