Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (编). Todrah. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
sealang.net
[1] (页面存档备份,存于互联网档案馆) Gregerson, Kenneth J. and Kenneth D. Smith. 1973. The development of Tơdrah register. MKS 4.
web.archive.org
[1] (页面存档备份,存于互联网档案馆) Gregerson, Kenneth J. and Kenneth D. Smith. 1973. The development of Tơdrah register. MKS 4.