Tieguhong Julius Chupezi, Verina Ingram, Jolien Schure: Impacts of artisanal gold and diamond mining on livelihoods and the environment in the Sangha Tri-National Park landscape. CIFOR 2009: S. 31. (google books) ISBN 978-602-8693-14-1
A. Almasi, A. Blom, I. M. A. Heitkönig, J. B. Kpanou, H. H. T. Prins: A survey of the apes in the Dzanga-Ndoki National Park, Central African Republic: A comparison between the census and survey methods of estimating the gorilla (Gorilla gorilla gorilla) and chimpanzee (Pan troglodytes) nest group density. In: African Journal of Ecology. Vol. 39. 2001: S. 98–105. ISSN0141-6707library.wur.nl.doi:10.1046/j.0141-6707.2000.00280.x
Field research. (Memento vom 19. Oktober 2010 im Internet Archive) Max Planck Institute for Evolutionary Anthropology, Department of Primatology. 19. September 2010.
A. Almasi, A. Blom, I. M. A. Heitkönig, J. B. Kpanou, H. H. T. Prins: A survey of the apes in the Dzanga-Ndoki National Park, Central African Republic: A comparison between the census and survey methods of estimating the gorilla (Gorilla gorilla gorilla) and chimpanzee (Pan troglodytes) nest group density. In: African Journal of Ecology. Vol. 39. 2001: S. 98–105. ISSN0141-6707library.wur.nl.doi:10.1046/j.0141-6707.2000.00280.x
A. Almasi, A. Blom, I. M. A. Heitkönig, J. B. Kpanou, H. H. T. Prins: A survey of the apes in the Dzanga-Ndoki National Park, Central African Republic: A comparison between the census and survey methods of estimating the gorilla (Gorilla gorilla gorilla) and chimpanzee (Pan troglodytes) nest group density. In: African Journal of Ecology. Vol. 39. 2001: S. 98–105. ISSN0141-6707library.wur.nl.doi:10.1046/j.0141-6707.2000.00280.x