Jacobson, Steven, A Practical Grammar of the Central Alaskan Yup'ik Eskimo Language, Fairbanks: Alaska Native Language Center, 1995, ISBN 978-1-55500-050-9
Jones, Glyn E., The distinctive vowels and consonants of Welsh, Martin J. Ball and Glyn E. Jones (編), Welsh Phonology: Selected Readings, Cardiff: University of Wales Press: 40–64, 1984, ISBN 0-7083-0861-9
Þráinsson, Höskuldur; Petersen, Hjalmar P.; Jacobsen, Jógvan í Lon; Hansen, Zakaris Svabo, Faroese – An Overview and Reference Grammar, Tórshavn: Føroya fróðskaparfelag, 2012, ISBN 9789991841854