Krugman, Paul R., author
Pearson Education , 2014
Buku Teks
General Agreement on Tariffs and Trade, 1971
Buku Teks
Czinkota, Michael R., author
The Dryden Press, 1992
Buku Teks
Das, Bhagirath Lal
Zed Books, 1999
Buku Teks
Ohlin, Bertil.
Harvard University Press, 1957
Buku Teks