Posadas-Leal, C., L. Chapa-Vargas, J. T. Arredondo-Moreno, and E. Huber-Sannwald. “RICHNESS AND DENSITY OF GRASSLAND BIRD SPECIES ASSESSED BY TWO METHODS”. Revista Mexicana De Ciencias Forestales, vol. 2, no. 3, July 2019, pp. 101-12, doi:10.29298/rmcf.v2i3.627.