1. ACCPE, 2004. From principles to action: applying the product sustainability toolbox. Department of Environment, Food, and Rural Affairs. Available from: 〈http://www.defra.gov.uk/environment/consumerprod/accpe/pubs.htp〉 (accessed 12.02.10).
2. APEC, 2009. Government procurement resources – Malaysia. Asia-Specific Economic Cooperation, Singapore. Available from: 〈http://www.apec.org/apec/apec_groups/committee_on_trade/government_procurement/resources/malaysia.html〉 (accessed 12.02.10).
3. Aitken, L., 2002. Towards a sustainable procurement strategy. A background paper prepared for the state sustainability strategy. Available from: 〈http://www.sustainability.dpc.wa.gov.au/BGPapers/LaurenAitken.pdf〉 (accessed 16.03.11).
4. Amalia, O., Christoph, E., 2003. Study contract to survey on the state of play of green procurement in the European union. Available from: 〈http://ec.europa.eu/environment/gpp/pdf/iceisstudy.pdf〉 (accessed 16.03.11).
5. Business-to-business e-procurement: success factors and challenges to implementation;Angeles;Supply Chain Manag.: Int. J.,2007