Rickard, J.A., author
Barnes & Noble, 1952
Buku Teks
compiled and edited by William L. Langer
Houghton Mifflin, 1968
Buku Referensi
Robenso, James Harvey
Ginn , 1931
Buku Teks
Johnson, Paul, author
Weidenfeld and Nicolson, 1983
Buku Teks
Vinacke, Harold M., author
Appleton-Century-Crofts, 1950
Buku Teks