Coulmas, Florian (1999). "Yupik writing". The Blackwell Encyclopedia of Writing Systems. Blackwell Publishers. pp. 572–573. ISBN 9780631194460. 9780631194460
Ian James, "Yugtun script", Sky Knowledge, April 2012 http://skyknowledge.com/yupik.htm
Coulmas, Florian (1999). "Yupik writing". The Blackwell Encyclopedia of Writing Systems. Blackwell Publishers. pp. 572–573. ISBN 9780631194460. 9780631194460
Coulmas, Florian (1999). "Yupik writing". The Blackwell Encyclopedia of Writing Systems. Blackwell Publishers. pp. 572–573. ISBN 9780631194460. 9780631194460