%0 Book Section %B Language change: Contributions to the study of its causes %D 1989 %T Sound Change is Drawn from a Pool of Synchronic Variation %A Ohala, John J. %E Breivik, L. E. %E Jahr, E. H. %B Language change: Contributions to the study of its causes %I Mouton de Gruyter %C New York %P 171–198