Heilbroner, R. L., & Thurow, L. C. (1975). The economic problem (4th ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Heilbroner, Robert L., agus Lester C. Thurow. The Economic Problem. 4th ed. Englewood Cliffs, N.J.: Prentice-Hall, 1975.
Lua MLA (8ú heag.)Heilbroner, Robert L., agus Lester C. Thurow. The Economic Problem. 4th ed. Prentice-Hall, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.