Vito, Gennaro F., author
Wadsworth, 1994
Buku Teks
Copeland, Thomas E., author
Addison-Wesley, 2005
Buku Teks
Walsh, Carl E., author
MIT Press, 2010
Buku Teks
Hall, Robert Ernest, author
W.W. Norton, 1986
Buku Teks
Modelski, George, author
Frederick A. Praeger, 1962
Buku Teks