00309nam a2200109Ia 4500008004100000040003800041100002000079245003800099250000800137260003300145653002100178211228s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aTrudgill, Peter 0aSociolinguistics: an introduction  a1st  bPenguin BooksaEnglandc1974  aSociolinguistics