Langer, Erick. “Indian Trade and Ethnic Economies in the Andes, 1780-1880.”. Estudios Interdisciplinarios de América Latina y el Caribe 15, no. 1 (January 21, 2004). Accessed December 8, 2022. http://www3.tau.ac.il/ojs/index.php/eial/article/view/825.