ZIMMERMANN, E. W. (1951). World Resources and Industries: A fungtional appraisal of the availability of agricultural and industrial materials. Harper & Brothers Publishers.
Lua i Stíl Chicago (17ú heag.)ZIMMERMANN, Erich W. World Resources and Industries: A Fungtional Appraisal of the Availability of Agricultural and Industrial Materials. Harper & Brothers Publishers, 1951.
Lua MLA (8ú heag.)ZIMMERMANN, Erich W. World Resources and Industries: A Fungtional Appraisal of the Availability of Agricultural and Industrial Materials. Harper & Brothers Publishers, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.