1Scott Barrett, International Cooperation and the International Commons, Duke Environmental Law & Policy Forum, Vol 10: 131, 1999,pp. 131.
2Hans Kelsen, The Essence of International Law, in The Relevance of International Law, edited by Karl Deutsch and Stanley Hoffman, Schenkman Publishing Company, 1968, pp. 118-119.
3Ingrid Detter, The International legal Order, Dartmouth Publishing Company Limited, 1998, pp.484.
