Grayson, George W.
Thomson, 2004
Buku Teks
Sennett, Richard
Yale University, 2006
Buku Teks
MIller, T. Christian
Littel, Brown and Company, 2006
Buku Teks
M. Furqon I. Hanief
1990
UI - Tesis (Membership)
Galbraith, John Kenneth, 1908-2006
Houghton Miffiln, 1952
Buku Teks