Não informado. (1919). Fertiliser, feeding stuffs and farm supplies journal. Association of British Organic Fertilisers.
Chicago-referens (17:e uppl.)Não informado. Fertiliser, Feeding Stuffs and Farm Supplies Journal. London: Association of British Organic Fertilisers, 1919.
MLA-referens (8:e uppl.)Não informado. Fertiliser, Feeding Stuffs and Farm Supplies Journal. Association of British Organic Fertilisers, 1919.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.