Healey, Joseph F. <br/><br/>
Statistics:  a tool for social research/ 

 - 4th ed. 
 - USA:  Thomson,  1996. 
 - 551p.:  ill.; 
<br/><br/>Include index 
<br/><br/><label>ISBN: </label>9780534251529 
<br/><br/><label>LC Class. No.: </label>HA29.H39  / hea2004