books.google.co.uk - This volume presents the long-anticipated results of several decades of inquiry into the social origins and social motivation of linguistic change.Written by one of the founders of modern sociolinguisticsFeatures the first complete report on the Philadelphia project designed to establish the social location...http://books.google.co.uk/books/about/Principles_of_Linguistic_Change_Social_F.html?id=LS_Ux3CEI5QC&utm_source=gb-gplus-sharePrinciples of Linguistic Change, Social Factors