Chapter 8,9, 10 in Sawyer, W. Charles, Sprinkle, Richard L. (2020). Applied international economics (5th ed.), London ; New York, New York: Routledge. (ebook available here)

Chapter 8 in Krugman, P. R. (2009). International economics: Theory and policy (8th ed.). Boston: Pearson/Addison Wesley. (library code EKV-1049)