L., H., R., C., T., L.(1981).The economic problem : Robert L. Heilbroner, Lester C. Thurow (Ed.ke-6).Englewood Cliffs:Prentice-Hall International.
Gaya MLA
Heilbroner, Robert, L.., Thurow, Lester, C.."The economic problem : Robert L. Heilbroner, Lester C. Thurow".Ed.ke-6Englewood Cliffs:Prentice-Hall International,1981.Textbook.