Não informado. (2001). Annual Report of the Massachusetts Extension Service. Massachusetts Extension Service.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Massachusetts Extension Service. Amherst, Mass: Massachusetts Extension Service, 2001.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Massachusetts Extension Service. Massachusetts Extension Service, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.