Vincent Nijman, (BirdLife International); Zoo), Carl Traeholt (Copenhagen; Ramesh Boonratana (Mahidol University International College, Thailand); Apes (SSA)), Susan Cheyne (IUCN SSC Primate Specialist Group’s Section on Small; Jatna Supriatna (Research Center for Climate Change, University of Indonesia) (21 Kasım 2015). "IUCN Red List of Threatened Species: Nasalis larvatus". IUCN Red List of Threatened Species. doi:10.2305/iucn.uk.2020-2.rlts.t14352a17945165.en. 28 Ekim 2018 tarihinde kaynağından arşivlendi. Erişim tarihi: 19 Eylül 2021.
iucnredlist.org
Vincent Nijman, (BirdLife International); Zoo), Carl Traeholt (Copenhagen; Ramesh Boonratana (Mahidol University International College, Thailand); Apes (SSA)), Susan Cheyne (IUCN SSC Primate Specialist Group’s Section on Small; Jatna Supriatna (Research Center for Climate Change, University of Indonesia) (21 Kasım 2015). "IUCN Red List of Threatened Species: Nasalis larvatus". IUCN Red List of Threatened Species. doi:10.2305/iucn.uk.2020-2.rlts.t14352a17945165.en. 28 Ekim 2018 tarihinde kaynağından arşivlendi. Erişim tarihi: 19 Eylül 2021.
web.archive.org
Vincent Nijman, (BirdLife International); Zoo), Carl Traeholt (Copenhagen; Ramesh Boonratana (Mahidol University International College, Thailand); Apes (SSA)), Susan Cheyne (IUCN SSC Primate Specialist Group’s Section on Small; Jatna Supriatna (Research Center for Climate Change, University of Indonesia) (21 Kasım 2015). "IUCN Red List of Threatened Species: Nasalis larvatus". IUCN Red List of Threatened Species. doi:10.2305/iucn.uk.2020-2.rlts.t14352a17945165.en. 28 Ekim 2018 tarihinde kaynağından arşivlendi. Erişim tarihi: 19 Eylül 2021.