Não informado. (2000). Bulletin of the West Virginia University Agricultural Experiment Station. West Virginia Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the West Virginia University Agricultural Experiment Station. Morgantown, Va: West Virginia Agricultural Experiment Station, 2000.
MLA-referens (8:e uppl.)Não informado. Bulletin of the West Virginia University Agricultural Experiment Station. West Virginia Agricultural Experiment Station, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.