Rechard A.Krueger  <br/>
Focus Groceps :A Practical Guide of Applied Research  
Rechard A.Krueger  
 - 2nd 
 - Soga Publ  Thausand Oaks Calif   1994 
 - 2810 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference<br/>Social Service