1. Altmann, S. A., 1959, Field observations on a howling monkey society, J. Mammal. 40:317–330.
2. Ankel-Simmons, F., 2000. An Introduction to Primate Anatomy, Academic Press, San Diego, CA, USA, pp. 349–380.
3. Baldwin, J. D., and Baldwin, J. I., 1972, Population density and use of space by howling monkeys (Alouatta villosa) in southwestern Panama, Primates 13: 371–379.
4. Balfour, D. A., and Bond, W. J., 1993, Factors limiting climber distribution and abundance in a southern Africa forest, J. Ecol. 81: 93–99.
5. Canales-Espinosa, D., 1992, Programa piloto de translocación del mono aullador (Alouatta palliata), Tesis de Licenciatura, Fac. de Medicina Veterinaria y Zootecnia, Universidad Veracruzana. Veracruz, Veracruz, México, p 97