APA Style
Krugman, P, R., Obstfeld, M. (1997).
International Economics: Appleyard and Field (2).
United States of America:
.
MLA Style
Krugman, Paul, R., Obstfeld, Maurice.
"International Economics: Appleyard and Field".
2
United States of America:
,
1997.
Magister Manajemen.