Awdur
Economist Intelligence Unit (Great Britain)
2
MCB University Press
2
National Association of Purchasing Management
2
Chartered Institute of Purchasing & Supply
1
Institute for Supply Management
1
Luleå tekniska universitet
1
Materiel Management Institute (Canada)
1
Raw Materials Group
1
United States. Bureau of Labor Statistics
1
Wyższa Szkoła Logistyki (Poznań, Poland)
1