Não informado. (1987). National Business Education Yearbook. National Business Education Association.
Chicago-referens (17:e uppl.)Não informado. National Business Education Yearbook. Reston, Va: National Business Education Association, 1987.
MLA-referens (8:e uppl.)Não informado. National Business Education Yearbook. National Business Education Association, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.