Vivar H., Mery, et al. “Comparison of Blood Urea Nitrogen Level Between Weaned Alpacas and Llamas Grazing Cultivated Pastures”. Revista De Investigaciones Veterinarias Del Perú, vol. 30, no. 1, Mar. 2019, pp. 193-00, https://doi.org/10.15381/rivep.v30i1.15691.