Não informado. (1945). Agriculture abroad. Department of Agriculture, Economics Division of the Marketing Service.
Chicago-referens (17:e uppl.)Não informado. Agriculture Abroad. Ottawa: Department of Agriculture, Economics Division of the Marketing Service, 1945.
MLA-referens (8:e uppl.)Não informado. Agriculture Abroad. Department of Agriculture, Economics Division of the Marketing Service, 1945.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.