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SIL International. "Grammatical Tone"互联网档案馆的存檔,存档日期2019-05-29.. SIL Glossary of Linguistic Terms. Retrieved 30 May 2019
Maddieson, Ian. Tone. Dryer, Matthew S.; Haspelmath, Martin (编). The World Atlas of Language Structures Online. Leipzig: Max Planck Institute for Evolutionary Anthropology. 2013 [2020-09-19]. (原始内容存档于2011-02-26).
Palancar, E. L.; Léonard, J.-L. Tone and inflection: An introduction. Palancar, E. L.; Léonard, J.-L. (编). Tone and Inflection: New Facts and New Perspectives. Berlin: Walter de Gruyter. 2016: 1–12 [2019-01-23]. (原始内容存档于2019-01-23).
Bateman, Janet. Iau Verb Morphology(PDF). Nusa, Linguistic Studies of Indonesian and Other Languages in Indonesia. Jakarta: Universitas Katolik Atma Jaya: 3rd (9th in PDF). (原始内容存档(PDF)于2017-03-04).