Setchell, J., & Dixson, A. (2001). Circannual changes in the secondary sexual adornments of semifree-ranging male and female mandrills (Mandrillus sphinx). American Journal of Primatology, 53, 109-121. https://doi.org/10.1002/1098-2345%28200103%2953%3A3%3C109%3A%3Aaid-ajp2%3E3.0.co%3B2-i