Silva-Piña, Mariana Jovita, et al. “Habitat Characteristics of Spotted Owl Roosting Sites (Strix Occidentalis Lucida) in the Sierra Madre Occidental, Mexico”. Huitzil Revista Mexicana De Ornitologí­a, vol. 19, no. 2, Mar. 2018, https://doi.org/10.28947/hrmo.2018.19.2.319.