Afra
[, другое название: Usku]Классификация: Isolate
·близок к исчезновению
Классификация: Isolate
·близок к исчезновению
Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·
Ethnologue: Languages of the World, 16th Edition (2009) . (2009) · edited by M. Paul Lewis · SIL International http://www.ethnologue.com/
Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas
World Oral Literature Project . http://www.oralliterature.org
Australia and the Pacific ( pp. 424-557 ) . Stephen A Wurm (2007) · In Encyclopedia of the World's Endangered Languages Routledge
The status of the least documented language families in the world ( pp. 177-212 ) . Hammarström, Harald (2010) · Language Documentation and Conservation. 4 http://scholarspace.manoa.hawaii.edu/bitstream/handle/10125/4478/hammarstrom.pdf;jsessionid=76414DD90F95DF076959B1AEB0158091?sequence=1
Orang Usku di daerah batas Timur, Senggi, Irian Jaya ( pp. 23 ) . Dumatubun, A. E. and Teddy K. Wanane (ca 1989) · Jayapura: s.n.
Draft Survey Report on the Usku Language of Papua . Youn-Shim Im and Randy Lebold (2006) ·
The J.~C.~Anceaux collection of wordlists of Irian Jaya languages B: Non-Austronesian (Papuan) languages (Part I) . Smits, L. and Voorhoeve, C. L. (1994) · Irian Jaya Source Material No.~9 Series B · Vol. 3 · Leiden-Jakarta: DSALCUL/IRIS
Miscellaneous Notes on Languages in West Irian, New Guinea ( pp. 47-114 ) . C. L. Voorhoeve (1971) · In Papers in New Guinea Linguistics 14 Pacific Linguistics: Series A · Vol. 28 · Canberra: Research School of Pacific and Asian Studies, Australian National University
Language isolates in the New Guinea region . Harald Hammarström (2017) · In Language isolates edited by Lyle Campbell, Thomas Dougherty, and Alexander D. Smith · London: Routledge