Westview Press, 1994
Buku Teks
Conason, Joe, author
Simon & Schuster, 2016
Buku Teks
Godwin, Jack, author
American Management Association, 2009
eBooks
by Martin Agronsky ... [et.al.]
Simon and Schuster, 1961
Buku Teks
Morton, Andrew
Dabara, 1999
Buku Teks