Não informado. (1968). Ceres. Food and Agriculture Organization of the United Nations.
Chicago-referens (17:e uppl.)Não informado. Ceres. Rome: Food and Agriculture Organization of the United Nations, 1968.
MLA-referens (8:e uppl.)Não informado. Ceres. Food and Agriculture Organization of the United Nations, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.