Conlombis, Theodore A
Abasdin, 1990
Buku Teks
Krugman, Paul R., author
RajaGrafindo Persada, 1994
Buku Teks
Krugman, Paul R., author
Addison-Wesley , 1997
Buku Teks
Cowen, Tyler, author
New Jersey, 2002
Buku Teks
A. Hasnan Habib, author
Centre for Strategic and International Studies, 1997
Buku Teks