Não informado. (1964). Training in business and industry. Gellert Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. Training in Business and Industry. New York: Gellert Publishing, 1964.
MLA-Zitierstil (8. Ausg.)Não informado. Training in Business and Industry. Gellert Publishing, 1964.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.