Heilbroner, R. L., & Ford, A. M. (1976). Economic relevance: A second look. Goodyear Pub. Co..
Lua i Stíl Chicago (17ú heag.)Heilbroner, Robert L., agus Arthur M. Ford. Economic Relevance: A Second Look. Pacific Palisades, Calif.: Goodyear Pub. Co., 1976.
Lua MLA (8ú heag.)Heilbroner, Robert L., agus Arthur M. Ford. Economic Relevance: A Second Look. Goodyear Pub. Co., 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.