Exchange Arrangements Entering the Twenty-First Century: Which Anchor will Hold?Ilzetzki, E., Reinhart, C. M., & Rogoff, K. S. (2019). Exchange arrangements entering the twenty-first century: Which anchor will hold? Quarterly Journal of Economics, 134(2), 599–646.
This article provides an excellent overview of the exchange system over the last two decades and a detailed discussion of the different types of exchange rate regime that countries employ.