edited by Stewart Sutherland, Leslie Houlden, Peter Clarke, Friedhelm Hardy
Routledge, 1988
Buku Referensi
Fryer, D.W.
McGraw-Hill, 1965
Buku Teks
by International Monetary Fund
International Monetary Fund, 1999
Buku Teks
Euromonitor, 1989
Buku Teks
Todaro, Michael P.
Longman, 1989
Buku Teks