1. 1993. Genetic analysis of hybrid zones. In: editor. Hybrid zones and the evolutionary process. Oxford: Oxford University Press. p 13-45.
2. 1995. Hybridization between Macaca tonkeana and Macaca hecki in central Sulawesi, Indonesia. Ph.D. dissertation, Yale University, New Haven, CT.
3. Confirmation and location of the hybrid zone between wild populations ofMacaca tonkeana andMacaca hecki in Central Sulawesi, Indonesia
4. Evidence of gene flow between Sulawesi macaques