Consonant sequences include NC (homorganic nasal–plosive), where C may be /bdtd̠ɟɡk/. Elsewhere, /bd/ are relatively rare and only occur before high vowels. /d̠/, written ⟨ḓ⟩ in the literature, is a laminal post-alveolar coronal stop that is indeterminate as to voicing. The phonemic status of [ʔ] is unclear; if [VʔV] is interpreted as vowel sequences /VV/, then this contrasts with long vowels (where the two V's are the same) and vowel sequences separated by linking glides (where the two V's are different).
Steinhauer, H. (1991). "Problems of Gorontalese Phonology". In Poeze, H. A.; Schoorl, P. (eds.). Excursies in Celebes: Een Bundel Bijdragen bij het Afscheid van J. Noorduyn als Directeur-Secretaris van het Koninklijk Instituut voor Taal-, Land- en Volkendkunde. KITLV Uitgeverij. pp. 325–338.
Little, John A. Jr. (1995). "Gorontalo". In Tryon, Darrell T. (ed.). Comparative Austronesian Dictionary: An Introduction to Austronesian Studies. Vol. 1. Berlin: Mouton de Gruyter. pp. 521–527. doi:10.1515/9783110884012.1.521. ISBN 978-3-11-088401-2. OCLC868970232.
Kasim, M. Musa; Wahidji, Habu; Pateda, Mansoer; Junus, Husain; Hasan, Kartin; Koem, A. P. (1981). Geografi Dialek Bahasa Gorontalo (in Indonesian). Jakarta: Pusat Pembinaan dan Pengembangan Bahasa – via repositori.kemdikbud.go.id.
Henley, David (1996). Nationalism and regionalism in a colonial context: Minahasa in the Dutch East Indies. Leiden: KITLV Press. doi:10.1163/9789004486928. ISBN 9789067180801. OCLC35113123.