Não informado. (1963). Intensive Agriculture. Ministry of Agriculture and Rural Development, Directorate of Extension.
Chicago-referens (17:e uppl.)Não informado. Intensive Agriculture. New Delhi: Ministry of Agriculture and Rural Development, Directorate of Extension, 1963.
MLA-referens (8:e uppl.)Não informado. Intensive Agriculture. Ministry of Agriculture and Rural Development, Directorate of Extension, 1963.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.