Glessner, K. D. G.; Britt, A. (2005). "Population Density and Home Range Size of Indri indri in a Protected Low Altitude Rain Forest". International Journal of Primatology. 26 (4): 855. doi:10.1007/s10764-005-5326-2. S2CID40595159.
Glessner, K. D. G.; Britt, A. (2005). "Population Density and Home Range Size of Indri indri in a Protected Low Altitude Rain Forest". International Journal of Primatology. 26 (4): 855. doi:10.1007/s10764-005-5326-2. S2CID40595159.