Shekelle, Myron; Meier, Rudolf; Indrawan, Mochamad; Maryanto, Ibnu; Salim, Agus; Supriatna, Jatna; Andayani, Noviar (2007). "When "Not Extinct" is Not Good News: Conservation in the Sangihe Islands". Conservation Biology21 (1): 4–5. PMID17298499. doi:10.1111/j.1523-1739.2006.00622_1.x.
primate-sg.org
Mittermeier, R. A.; Wallis, J.; Rylands, A. B.; Ganzhorn, J. U.; Oates, J. F.; Williamson, E. A.; Palacios, E.; Heymann, E. W.; Kierulff, M. C. M.; Long Yongcheng, S.; Supriatna, J.; Roos, C.; Walker, S.; Cortés-Ortiz, L. & Schwitzer, C. (2010): Primates in Peril: The World's 25 Most Endangered Primates 2008–2010Arquivado 23 de xullo de 2011 en Wayback Machine.. Arlington, VA, USA: IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS) e Conservation International (CI). ISBN 978-1-934151-34-1, pp. 1–92.
springer.com
link.springer.com
Brandon-Jones, D.; Eudey, A. A.; Geissmann, T.; Groves, C. P.; Melnick, D. J.; Morales, J. C.; Shekelle, M. & Stewart, C.-B. (2004): Asian primate classificationInternational Journal of Primatology25: 97.
Mittermeier, R. A.; Wallis, J.; Rylands, A. B.; Ganzhorn, J. U.; Oates, J. F.; Williamson, E. A.; Palacios, E.; Heymann, E. W.; Kierulff, M. C. M.; Long Yongcheng, S.; Supriatna, J.; Roos, C.; Walker, S.; Cortés-Ortiz, L. & Schwitzer, C. (2010): Primates in Peril: The World's 25 Most Endangered Primates 2008–2010Arquivado 23 de xullo de 2011 en Wayback Machine.. Arlington, VA, USA: IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS) e Conservation International (CI). ISBN 978-1-934151-34-1, pp. 1–92.