00290nam a2200109 a 450000500170000008200170001710000220003424500560005625000110011226000420012330000150016520251203090657.0  a410,bD, Int  aWardhaugh, Ronald  aIntroduction to Linguistics, Ronald Wardhaugh, eng.  a2nd ed  aNew York, McGraw-Hill Book Co.,c1977  aviii,268p.