Koch A <br/><br/>
What Did You Say? A Guide To The Communication Skills 

 -  Englewood Cliffs : Prentice 1985. 
 - 354 
 - Developments In Soil Science No. 13 .
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>0139519890 (Pbk)