Leenders, M. R. (1965). Improving purchasing effectiveness through supplier development. Division of Research, Graduate School of Business Administration, Harvard University.
Lua i Stíl Chicago (17ú heag.)Leenders, Michiel R. Improving Purchasing Effectiveness Through Supplier Development. Boston: Division of Research, Graduate School of Business Administration, Harvard University, 1965.
Lua MLA (9ú heag.)Leenders, Michiel R. Improving Purchasing Effectiveness Through Supplier Development. Division of Research, Graduate School of Business Administration, Harvard University, 1965.
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