Vásquez, Genaro V. 1938. Legislación del trabajo en los siglos XVI, XVII, y XVIII. Mexico City: Departamento del Trabajo, pp. 142–143.

To read more:

Haring, C.H. 1947. The Spanish Empire in America. New York, New York: Oxford University Press.

Klein, Herbert S. 1998. The American Finances of the Spanish Empire: Royal Income and Expenditures in Colonial Mexico, Peru, and Bolivia, 1680–1809. Albuquerque, New Mexico: University of New Mexico Press.