Cayon, E., Garzon, N. A., & Perez, J. S. (2019). The Effects of Global, Regional, and Local Macroeconomic Events on the Price of the Colombian Castilla Blend. International Journal of Energy Economics and Policy, 9(6), 118–123. Retrieved from https://www.econjournals.com/index.php/ijeep/article/view/8220