Language history, language change, and language relationship: an introduction to historical and comparative linguistics
Hans Henrich Hock · Mouton de Gruyter · 2009
Wikipedia
{{cite book |last=Hock |first=Hans Henrich |title=Language history, language change, and language relationship: an introduction to historical and comparative linguistics |publisher=Mouton de Gruyter |year=2009 |isbn=9783110214291}}