Não informado. (2004). European Journal of Purchasing and Supply Management. Butterworth Heinemann.
Lua i Stíl Chicago (17ú heag.)Não informado. European Journal of Purchasing and Supply Management. Oxford, Inglaterra: Butterworth Heinemann, 2004.
Lua MLA (8ú heag.)Não informado. European Journal of Purchasing and Supply Management. Butterworth Heinemann, 2004.
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