European Institute for Purchasing Management (EIPM)
Deutscher Akademischer Austauschdienst
Procurementnetwork.eu
Procurementnetwerk.nl
Procurementnetwork.es
Procurementadvies.nl
Procurementeducation.eu
Procurementvacatures.nl
Procurementvacancies.co.uk
Procurementvacancies.de
CIPS
Procurementleaders.com
APICS
Institute for Supply Management ISM