edited by M.A. Bienefeld and Martin Godfrey
John Wiley & Sons, 1982
Buku Teks
A.B. Susanto, author
Elex Media Komputindo , 1998
Buku Teks
Maurice Obstfeld, author
Cambridge University Press, 2004
eBooks
Callinicos, Alex, author
Eduka, 2008
Buku Teks
Henderson, Hazel, author
Kumarian Press, 1999
Buku Teks