Não informado. (1964). Training in business and industry. Gellert Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Training in Business and Industry. New York: Gellert Publishing, 1964.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Training in Business and Industry. Gellert Publishing, 1964.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.