Não informado. (1931). Credit and financial management. National Association of Credit Management.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Credit and Financial Management. New York: National Association of Credit Management, 1931.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Credit and Financial Management. National Association of Credit Management, 1931.
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