Anthony Jukes. Australian Society of Indonesian Language Educators (ASILE). [dostęp 2023-06-03]. [zarchiwizowane z tego adresu (2023-06-03)]. Cytat: His research project was to document and describe Toratán (Ratahan), a highly endangered language spoken by about 150 people in a handful of villages located in North Sulawesi (ang.).
M. PaulM.P.LewisM. PaulM.P., Gary F.G.F.SimonsGary F.G.F., Charles D.Ch.D.FennigCharles D.Ch.D. (red.), Ratahan, [w:] Ethnologue: Languages of the World, wyd. 18, Dallas: SIL International, 2015 [dostęp 2021-08-08] [zarchiwizowane z adresu 2015-09-18](ang.).
David Mead: Ratahan. Sulawesi Language Alliance. [dostęp 2023-01-12]. (ang.).
web.archive.org
M. PaulM.P.LewisM. PaulM.P., Gary F.G.F.SimonsGary F.G.F., Charles D.Ch.D.FennigCharles D.Ch.D. (red.), Ratahan, [w:] Ethnologue: Languages of the World, wyd. 18, Dallas: SIL International, 2015 [dostęp 2021-08-08] [zarchiwizowane z adresu 2015-09-18](ang.).
weebly.com
asileconference2016.weebly.com
Anthony Jukes. Australian Society of Indonesian Language Educators (ASILE). [dostęp 2023-06-03]. [zarchiwizowane z tego adresu (2023-06-03)]. Cytat: His research project was to document and describe Toratán (Ratahan), a highly endangered language spoken by about 150 people in a handful of villages located in North Sulawesi (ang.).