Reference
S. M. Das, B.D. Sharma (1979): Observations on a remarkable association of the rhesus monkey
(Macaca mulatta villosa) with the Himalayan langur (Presbytis
entellus schistaceus) in the Kumaun Himalayas, India – Mammalian Biology (früher Zeitschrift für Säugetierkunde) – 45: 124 - 125.