Villar, David, and David J Schaeffer. “Ivermectin Use on Pastured Livestock in Colombia: Parasite Resistance and Impacts on the Dung Community”. Revista Colombiana de Ciencias Pecuarias 36, no. 1 (May 5, 2022): 3–12. Accessed January 31, 2025. https://revistas.udea.edu.co/index.php/rccp/article/view/349544.