Não informado. (2001). Annual report of the Grassland Research Institute. Grassland Research Institute.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Grassland Research Institute. Berkshire, Inglaterra: Grassland Research Institute, 2001.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Grassland Research Institute. Grassland Research Institute, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.