001: 32268
003: Starlibrary PMS 4.5
005: 20180430
066: ^aDa..
072: ^aACQUISITION AND PROFICIENCY
082: ^a428
100: ^aDavid Crystal
240: ^a.SOCIOLINGUISTICS
245: ^a.SOCIOLINGUISTICS
260: ^c1982
650: ^aBILIGUALISM AND MULTILINGUALISM
650: ^aDIALECTAL AND STYLISTIC VARIATION
650: ^aSTANDARD LANGUAGE AND NATIONAL LANGUAGE