Gaya APA
L., H., R., C., T., L. (1981).
The economic problem : Robert L. Heilbroner, Lester C. Thurow (Ed.ke-6).
Jakarta:
.
Gaya MLA
Heilbroner, Robert, L.., Thurow, Lester, C..
"The economic problem : Robert L. Heilbroner, Lester C. Thurow".
Ed.ke-6
Jakarta:
,
1981.
Textbook.