Krugman, Paul R., author
International economics : theory and policy
Scott, Foresman, 1988
 Buku Teks
Krugman, Paul R., author
International economics : theory and policy
Addison-Wesley, 2000
 Buku Teks
Krugman, Paul R., author
International economics : theory and policy
Pearson Education , 2014
 Buku Teks
Krugman, Paul R., author
International economics : theory and policy
Harper Collins Publishers , 1991
 Buku Teks
Friedrich, Klaus
International economics/Klaus Friedrich
McGraw-Hill Kogakusha, 1974
 Buku Teks
Krugman, Paul R., author
International economics : theory and policy
Harper Collins , 1994
 Buku Teks