Self, Peter, author
George Allen & Unwin, 1974
Buku Teks
Fesler, James W. (James William), 1911-2005, author
Chatam House, 1991
Buku Teks
Caldwell, Lynton Keith, author
University of Chicago Press, 1944
Buku Teks
Denhardt, Robert B., author
Thomson/Wadsworth, 2004
Buku Teks
Denhardt, Robert B., author
Cengage Learning, 2015
Buku Teks