Price, Marie (January 1994). "Hands for the coffee: migrants and western Venezuela's coffee production, 1870-1930". Journal of Historical Geography. 20 (1): 62–80. doi:10.1006/jhge.1994.1006.
Centeno, Tomas; Revello, Ernesto. "Venezuela - Historical Review"(PDF). Emerging Countries Organization. Archived from the original(PDF) on 27 November 2014. Retrieved 12 May 2013.
Centeno, Tomas; Revello, Ernesto. "Venezuela - Historical Review"(PDF). Emerging Countries Organization. Archived from the original(PDF) on 27 November 2014. Retrieved 12 May 2013.