1. Adkisson, Stephen C., “Integration in West Africa: An Empirical Examination of ECOWAS.” Dissertations and Theses. Paper 3277, Portland State University MA thesis, 1984.
2. Afrika, Jean-Guy K., and Gerald Ajumbo, 2012, “Informal Cross Border Trade in Africa: Implications and Policy Recommendations.” African Development Bank 3, no. 10.
3. Aker, Jenny C., Michael W. Klein, Stephen A. O’Connell, and Muzhe Yang, “Borders, Ethnicity and Trade.” Boston, Massachusetts, Tufts University, 2013, Accessed June 2, 2019, http://sites.tufts.edu/jennyaker/files/2010/02/Niger_Border-March-2013.pdf.
4. Beetsma, Roel, and Massimo Giuliodori, “The Macroeconomic Costs and Benefits of the EMU and Other Monetary Unions: An Overview of Recent Research.” Journal of Economic Literature 48, no. 3 (2010): 603–641. https://doi.org/10.1257/jel.48.3.603.
5. Brauer, Jurgen, “Introduction.” Defence and Peace Economics 14, no. 3 (2003): 151–153.
[Introduction to special issue: Economics of Conflict, War, and Peace in Historical Perspective.].