1. BuyZET, 2017a. BuyZET mapping methodology. BuyZET, Deliverable 2.1
2. BuyZET, 2017b. Procurement transportation and emission report. City of Rotterdam. BuyZET Develirable 2.2
3. BuyZET, 2018. website: www.buyzet.eu and deliverables http://www.buyzet.eu/publication/
4. GLEC, 2016. GLEC framework (http://www.smartfreightcentre.org/glec/what-is-glec)
5. The Greenhouse Gas Protocol for the U.S. Public Sector;WRI et LMI,2013