1. Keil, S. (2016) Free Trade Agreements—A Brief History. European Think Tank. https://www.citethisforme.com/cite/sources/websitemanualcite
2. Veld, J. (2019) Quantifying the Economic Effects of the Single Market in a Structural Macromodel. European Commission’s Directorate-General for Economic and Financial Affairs, 5. https://ec.europa.eu/info/sites/default/files/economy-finance/dp094_en.pdf
3. Deutsche Bank DB Research (2013) The Single European Market 20 Years on Achievements, Unfulfilled Expectations & Further Potential. Deutsche Bank AG DB Research, Frankfurt am main, 2. https://www.dbresearch.com/PROD/RPS_EN-PROD/The_Single_European_Market_20_years_on%3A_Achievemen/RPS_EN_DOC_VIEW.calias?rwnode=PROD0000000000435631&ProdCollection=PROD0000000000444504
4. Sánchez, A. (2018) Building a Stronger and More Integrated Europe. OECD Economics Department, East Jerusalem, 8, 9 & 12. https://www.oecd.org/officialdocuments/publicdisplaydocumentpdf/?cote=ECO/WKP(2018)39&docLanguage=En
5. https://trade.ec.europa.eu/doclib/docs/2019/march/tradoc_157716.pdf