Greenberg, Joseph H. (1970). "Some Generalizations concerning Glottalic Consonants, Especially Implosives". International Journal of American Linguistics. 36 (2): 123–145. doi:10.1086/465105. JSTOR1264671. S2CID143225017.
Greenberg, Joseph H. (1970). "Some Generalizations concerning Glottalic Consonants, Especially Implosives". International Journal of American Linguistics. 36 (2): 123–145. doi:10.1086/465105. JSTOR1264671. S2CID143225017.
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Greenberg, Joseph H. (1970). "Some Generalizations concerning Glottalic Consonants, Especially Implosives". International Journal of American Linguistics. 36 (2): 123–145. doi:10.1086/465105. JSTOR1264671. S2CID143225017.
Maddieson, Ian. 2008. Glottalized Consonants. In: Haspelmath, Martin & Dryer, Matthew S. & Gil, David & Comrie, Bernard (eds.) The World Atlas of Language Structures Online. Munich: Max Planck Digital Library, chapter 7. Accessed on 2008-03-28 via Wals info.