Friederich, Carl J
Cornell University Press, 1957
Buku Teks
Appleton-Century-Crofts, 1951
Buku Teks
Childe, V. Gordon, author
Alfred A. Knopf, 1958
Buku Teks
Rice, Eugene F., author
W.W. Norton, 1970
Buku Teks
Burns, Edward McNall, 1897-1972, author
W.W. Norton & Company, 1973
Buku Teks