Engelhardt, A, Fischer, J, Neumann, C, Pfeifer, J-B and Heistermann, M (2012) Information content of female copulation calls in wild long-tailed macaques (Macaca fascicularis). Behavioral Ecology and Sociobiology, 66 (1). pp. 121-134. ISSN 0340-5443

Engelhardt, A, Pfeifer, J-B, Heistermann, M, Niemitz, C, van Hooff, JARAM and Hodges, JK (2004) Assessment of female reproductive status by male longtailed macaques, Macaca fascicularis, under natural conditions. Animal Behaviour, 67 (5). pp. 915-924. ISSN 0003-3472