Blevins, Juliette 2004. Evolutionary Phonology. The Emergence of Sound Patterns. Cambridge University Press. [Paperback] ISBN: 0-521-04364-6. (366 sider.)
Ladefoged, Peter & Ian Maddieson 1996. The Sounds of the World's Languages. Blackwell. [Paperback] ISBN: 0-631-19815-6. (426 sider.)