Esquivel, C., J. M. De la O, S. . Sánchez Vargas, S. Paniagua, A. Esquivel Cambronero, D. Núñez, and G. Quesada Ávila. “Anthropogenic Materials Used by Birds to Nest in an Urban Landscape of Costa Rica”. UNED Research Journal, vol. 12, no. 2, Oct. 2020, p. e3124, doi:10.22458/urj.v12i2.3124.