Wittkopf, Eugene R., author
Thomson wadsworth, 2008
Buku Teks
Eugene R. Wittkopf, James M. McCormick, editor
Rowman & Littlefield publisher INC, 2008
Buku Teks
Kissinger, Henry A., author
Weidenfeld & Nicolson, 1969
Buku Teks
Leopold, Richard W., author
Alfred A. Knopf, 1962
Buku Teks
Montgomery, John D., author
Frederick A. Praeger, 1962
Buku Teks