Krugman, Paul R., author
Addison-Wesley, 2000
Buku Teks
edited by Roy Harrod
Martin Press, 1965
Buku Teks
Krugman, Paul R., author
Harper Collins Publishers , 1991
Buku Teks
Krugman, Paul R., author
Harper Collins , 1994
Buku Teks
Root, Franklin R., author
South-Western Publishing, 1978
Buku Teks