Estrada-Cely, Gloria, and Diego Pinto-Díaz. “Study of the Colombian Normative Framework for Horses As Blood Traction Vehicles”. Ciencia y Agricultura 15, no. 1 (February 1, 2018): 69-80. Accessed November 20, 2019. https://revistas.uptc.edu.co/revistas/index.php/ciencia_agricultura/article/view/7758.