@inbook {Ohala1989,
	title = {Sound Change is Drawn from a Pool of Synchronic Variation},
	booktitle = {Language change: Contributions to the study of its causes},
	year = {1989},
	pages = {171{\textendash}198},
	publisher = {Mouton de Gruyter},
	organization = {Mouton de Gruyter},
	address = {New York},
	author = {Ohala, John J.},
	editor = {Breivik, L. E. and Jahr, E. H.}
}
