Não informado. (1974). Journal of Purchasing and Materials Management. National Association of Purchasing Management.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Purchasing and Materials Management. Oradell, NJ: National Association of Purchasing Management, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Purchasing and Materials Management. National Association of Purchasing Management, 1974.
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