Não informado. (1964). Training in business and industry. Gellert Publishing.
Chicago-referens (17:e uppl.)Não informado. Training in Business and Industry. New York: Gellert Publishing, 1964.
MLA-referens (8:e uppl.)Não informado. Training in Business and Industry. Gellert Publishing, 1964.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.