Noorduyn, J. (1982). "Sound Changes in the Gorontalo Language". In Halim, A.; Carrington, L.; Wurm, S.A. (eds.). Papers from the Third International Conference on Austronesian Linguistics, Vol. 2: Tracking the travellers. Pacific Linguistics, C-75. Canberra: Australian National University. pp. 241–261. doi:10.15144/PL-C75.241. hdl:1885/145067. ISBN978-0-85883-275-6.
Noorduyn, J. (1982). "Sound Changes in the Gorontalo Language". In Halim, A.; Carrington, L.; Wurm, S.A. (eds.). Papers from the Third International Conference on Austronesian Linguistics, Vol. 2: Tracking the travellers. Pacific Linguistics, C-75. Canberra: Australian National University. pp. 241–261. doi:10.15144/PL-C75.241. hdl:1885/145067. ISBN978-0-85883-275-6.