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D. Working Papers
Baldwin, Richard, Daria Taglioni, ” Gravity for Dummies and Dummies for
Gravity Equations“ National Bureau of Economic Research )NBER( Working
Paper No. 12516 )Cambridge: NBER, September 2006(.
Durbarry, Ramesh, Tourism Expenditure in the UK: Analysis of Competitiveness
Using a Gravity-Based Model )Nottingham: Christel Dehaan Tourism and
Research Institute, Nottingham University Business School, 2001(.
Gnidchenko, Andrey A., Vladimir A. Salnikov, ” Net Comparative Advantage
Index: Overcoming The Drawbacks of The Existing Indices“ Basic Research
Program Working Papers No. 119 )Moscow: The National Research University
Higher School of Economics ,2015(.
Porter, Michael, E., The Competitive Advantage of Nations: With a new
Introduction )New York: The Free Press, 1990(.
Woolfrey, Sean, The Political Economy of Regional Integration In Africa:
Common Market For Eastern and Southern Africa )COMESA( )Maastricht: The
European Centre for Development Policy Management )ECDPM(, January
2016(.

E. Electronic Sources
Bali &Indonesia on the Net, How far is it? http://www.indo.com/distance/,
UN comtrade, United Nations Commodity Trade Statistics Database, https://
comtrade.un.org/db/mr/rfCommoditiesList.aspx?px=S1&cc
World Bank, World Bank Open Data, http://data.worldbank.org/
World bank, Trade Indicators, http://wits.worldbank.org/wits/wits/witshelp/
Content/Utilities/e1.trade_indicators.htm

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