00514nam 2232268 450000100060000000300230000600500090002900800410003808200080007907200320008710000180011926000250013724500220016265000320018465000360021665000380025265000440029032268StarLibrary Marc Built20180430201711 ||||| |||||||||||amh  a428 aACQUISITION AND PROFICIENCY aDavid Crystal bPENGUIN BOOES c1982 a.SOCIOLINGUISTICS aACQUISITION AND PROFICIENCY aBILIGUALISM AND MULTILINGUALISM aDIALECTAL AND STYLISTIC VARIATION aSTANDARD LANGUAGE AND NATIONAL LANGUAGE