2Anna Henriksen. Voluntary Environmental Labelling and World Trade Organization. International Trade, Environment and Development with Christian Friis Bach at Institute of Economics Copenhagen University, 1998.10.
3Janet Chakarian, Eco- labelling and GATT, Eco- labelling and InTernational Trade, Edited by Simonetta Zarrilli, Veena Jha and Rene Vossenaar ,Foreword by Rubens Ricupero ,Secretary General of UNCTAD, 1997,P263.
4Rene Vossenaar,Eco- labelling and International Trade:The Main Issues,Eco- labelling and International Trade,Edited by Simonetta Zarrilli,Veena Jha and Rene Vossenaar ,Foreword by Rubens Ricupero ,Secretary General of UNCTAD,1997,P22.
5http://www. wto. org
6Anil Markandya, Eco- labelling:An Introduction and Review, Eco- labelling and International Trade,Edited by Simonetta Zarrilli,Veena Jha and Rene Vossenaar ,Foreword by Rubens Ricupero ,Secretary General of UNCTAD,1997,P16.