Não informado. (1946). Extension service news. Virginia Polytechnic Institute, Agricultural Extension Service.
Chicago-referens (17:e uppl.)Não informado. Extension Service News. Blacksburg, Va: Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
MLA-referens (8:e uppl.)Não informado. Extension Service News. Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.