TY - CHAP T1 - Sound Change is Drawn from a Pool of Synchronic Variation T2 - Language change: Contributions to the study of its causes Y1 - 1989 A1 - Ohala, John J. ED - Breivik, L. E. ED - Jahr, E. H. JF - Language change: Contributions to the study of its causes PB - Mouton de Gruyter CY - New York ER -