Little, A. W. Selwyn
The United States Armed Forces Institute, 1941
Buku Teks
Williamson, Harold F., author
Prentice-Hall, 1951
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1955
Buku Teks
North, Douglass C., author
Princeton University Press, 2005
Buku Teks
Rosen, George, author
University California Press, 1966
Buku Teks