Fesler, James W. (James William), 1911-2005
Chatam House, 1991
Buku Teks
Caldwell, Lynton Keith
University of Chicago Press, 1944
Buku Teks
Denhardt, Robert B.
Thomson/Wadsworth, 2004
Buku Teks
Denhardt, Robert B.
Cengage Learning, 2015
Buku Teks
edited by Jerri Killian; Niklas Eklund
CRC Press, 2008
Buku Teks