1. Aberdeen and Grampian Chamber of Commerce. (2016). 2016 Scottish Parliament Election Manifesto: Strong and Sustainable. A Plan for the North-East. Aberdeen.
2. Aldrich, H. E. (2008). Organizations and Environments. Stanford, CA: Stanford University Press.
3. American Chamber of Commerce to the European Union (AmCham EU). (2020). About Us: Annual Report 2015. Brussels. Retrieved June 30, 2020, from http://www.amchameu.eu/about-us.
4. Baroni, L., Brendan, J. C., Chalmers, A. W., Marquez, L. M. M., & Rasmussen, A. (2014). Defining and Classifying Interest Groups. Interest Groups & Advocacy, 3, 141–159. https://doi.org/10.1057/iga.2014.9.
5. Baumgartner, F. R., & Leech, B. L. (2001). Interest Niches and Policy Bandwagons: Patterns of Interest Group Involvement in National Politics. The Journal of Politics, 63, 1191–1213. https://doi.org/10.1111/0022-3816.00106.