Kurtzig, M. E. (1974). Agricultural production and trade. U.S. Dept. of Agriculture, Economic Research Service.
Chicago-referens (17:e uppl.)Kurtzig, Michael E. Agricultural Production and Trade. [Washington]: U.S. Dept. of Agriculture, Economic Research Service, 1974.
MLA-referens (8:e uppl.)Kurtzig, Michael E. Agricultural Production and Trade. U.S. Dept. of Agriculture, Economic Research Service, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.