Galbraith, John Kenneth, 1908-2006
British Broadcasting Corporation, 1977
Buku Teks
Commons, John R.
The University of Wisconsin Press, 1961
Buku Teks
Beaud, Michel
Routledge, 1997
Buku Teks
Heilbroner, Robert L.
Bumi Aksara , 1994
Buku Teks
Negishi, Takashi
Cambridge University Press , 1985
Buku Teks