00293nam a2200121 a 450000500170000008200130001710000160003010000190004624500250006526000310009030000280012163000220014920251203091156.0  a407bBRO  aBrown, John  aJackson, David  aVarieties of writing  aHong KongbMacmillanc1987  aviii,240 p.b22 cm.cPB  aLanguage teaching