Heilbroner, R. L., & Thurow, L. C. (1981). Five economic challenges. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Heilbroner, Robert L., agus Lester C. Thurow. Five Economic Challenges. Englewood Cliffs, N.J: Prentice-Hall, 1981.
Lua MLA (9ú heag.)Heilbroner, Robert L., agus Lester C. Thurow. Five Economic Challenges. Prentice-Hall, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.