3Donald Puehala, Raymond Hopkins. Interna- tional Regimes: Lessons from Inductive Analysis, in Stephen Krasner, ed. International Regimes, Peking University Press, 2005, p.65.
4Charles Lipson. Why are Some International Agreements Informal?. International Organization, 1991, 45(4): oo.495-512.
5Andrew, F., Cooper & Ramesh Thakur. The Group of Twenty(G20). Routledge, 2013, (9): pp. 121-135.
6Richard Eccleston, Aynsley Kellow, Peter Carroll. G20 Endorsement in Post Crisis Global Governance: More Than a Toothless Talking Shop?. The British Journal of Politics and Inter- national Relations, 2015, 5(17): pp.298-317.
7Michael Callaghan, Chetan Ghate, Stephen Pickford, Francis Rathinam. Global Cooperation Among G20 Countries: Responding to the Crisis and Restoring Growth. Springer, 2013, 12 (10): pp. 1 -21.
8Mike Callaghan. Relaunching the G20. Lowy Institute for International Policy, 2013, (1): pp.3-14.