Праславянски и старобългарски фонологически изменения Велчева, Боряна, авт . 1980. Праславянски и старобългарски фонологически изменения. София: БАН.
The sound pattern of Russian; a linguistic and acoustical investigation Halle, Morris, авт . 1971. The sound pattern of Russian; a linguistic and acoustical investigation. Description and analysis of contemporary standard Russian. 2nd изд. (Description And Analysis Of Contemporary Standard Russian). 's-Gravenhage: Mouton.
The Sound Pattern of English Chomsky, Noam & Morris Halle, авт-ри . 1968. The Sound Pattern of English. New York: Harper & Row.
Glossary of linguistic terms Loos, Eugene E (ред).. 2004. Glossary of linguistic terms. (ред)Eugene E Loos. https://glossary.sil.org/ (2018-12-05).