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Nag, Chetan KS and Pramod, P and Karanth, Praveen K (2011) Taxonomic Implications of a Field Study of Morphotypes of Hanuman Langurs (Semnopithecus entellus) in Peninsular India. In: International Journal of Primatology, 32 (4). pp. 830-848.
Hohmann, G and Vogl, L (1991) Loud calls of male Nilgiri langurs (Presbytis johnii): Age-, individual-, and population-specific differences. In: International Journal of Primatology, 12 (5). 503 -527.
Hohmann, G (1989) Group fission in Nilgiri langurs (Presbytis johnii). In: International Journal of Primatology, 10 (5). pp. 441-454.