Leech, Geoffrey <br/><br/>
A communicative grammar of english. 

 - London :  Longman,  1979. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inglés
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>802.0-07