Resources for the Future & Fischman, L. L. (1980). World mineral trends and U.S. supply problems. Resources for the Future.
Lua i Stíl Chicago (17ú heag.)Resources for the Future agus Leonard L. Fischman. World Mineral Trends and U.S. Supply Problems. Washington, D.C: Resources for the Future, 1980.
Lua MLA (9ú heag.)Resources for the Future agus Leonard L. Fischman. World Mineral Trends and U.S. Supply Problems. Resources for the Future, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.