Não informado. (1947). Business Education Forum. National Business Education Association.
Chicago-referens (17:e uppl.)Não informado. Business Education Forum. Washington: National Business Education Association, 1947.
MLA-referens (8:e uppl.)Não informado. Business Education Forum. National Business Education Association, 1947.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.