Kankane, P. L. “Environmental Factors and Reproductive Seasonality in the Indian Langur, <i>Presbytis entellus< I>, on the Indian Subcontinent”. Records of the Zoological Survey of India, vol. 85, no. 1, Mar. 1988, pp. 19-35, doi:10.26515/rzsi/v85/i1/1988/161064.