00277nam a2200109 a 450000500170000002000150001708200160003210000200004824500250006826000480009330000260014120251203110104.0  a0521288967  a401.41bGUM  aGumperz, John J  aDiscourse strategies  aCambridgebCambridge University Pressc1998  axii,225p.c23 cm P.B.