Altmann, S. A. (1959). Field observations of a howling monkey society.J. Mammal.
Altmann, S.A., and Altmann, J. (1970).Baboon Ecology, University of Chicago Press, Chicago.
Bernstein, I. S. (1964). A field study of the activities of howler monkeys.Anim. Behav.
Carpenter, C. R. (1934). A field study of the behavior and social relations of howling monkeys (Alouatta palliata).Comp. Psychol. Monogr. 10: 1–168.
Caughley, G. (1966). Mortality patterns in mammals.Ecology
Charles-Dominique, P. (1977).Ecology and Behavior of Nocturnal Primates, Columbia University Press, New York.
Olivers, D. J. (1969). On the daily behaviour and spacing of howling monkey groups.Folia Primatol. 10: 48–102.
Collias, D. E., and Southwick, C. H. (1952). A field study of the population density and social organization in howler monkeys.Proc. Am. Phil. Soc. 96: 143–156.
Croat, T. B. (1975). Phenological behavior of habit and habitat classes on Barro Colorado Island (Panama Canal Zone).Biotropica
Dittus, W. P. J. (1977). The social regulation of population density and age-sex distribution in the Toque monkey.Behaviour 63: 281–322.
Dittus, W. P. J. (1979). The evolution of behaviors regulating density and age-specific sex ratios in a primate population.Behaviour 69: 265–302.
Drickhamer, L. C. (1974). A ten-year summary of reproductive data for free-rangingMacaca mulatto
. 21: 61–80.CrossRef
Froehlich, J. W., Thorington, R. W., Jr., and Otis, J. S. (1981). The demography of howler monkeys (Alouatta palliata) on Barro Colorado Island, Panamá.Int. J. Primatol. 2: 209–238.
Foster, R. B. (1973).Seasonality of Fruit Production and Seed Fall in a Tropical Forest Ecosystem in Panama, Doctoral thesis, Duke University, Durham, N.C.
Gaulin, S. J. C., Knight, D. H., and Gaulin, C. K. (1980). Local variance inAlouatta
group size and food availability on Barro Colorado Island.Biotropica
Milton, K. (1977).The Foraging Strategy of the Howler Monkey in the Tropical Forest of Barro Colorado Island, Panamá, Doctoral thesis, New York University, New York.
Mittermeier, R. A. (1973). Group activity and population dynamics of the howler monkey on Barro Colorado Island.Primates
Pope, B. L. (1968). Population characteristics.Bibl. Primatol. 7: 13–20.
Rails, K., Brownell, R. L., Jr., and Ballou, J. (1980). Differential mortality by sex and age in mammals, with specific reference to the sperm whale.Rep. Int. What. Comm. (Special Issue 2): 233–243.
Richard, A. (1970). A comparative study of the activity patterns and behavior ofAlouatta villosa
andA teles geoffroyi
Smith, C. C. (1977). Feeding behaviour and social organization in howling monkeys. In Clutton-Brock, T. M. (ed.),Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys, and Apes, Academic Press, London.
Young, O. P. (1978).Resource Partitioning in a Neotropical Necrophagous Scarab Guild, Doctoral thesis, University of Maryland, College Park.