Cohen, Louis <br/><br/>
Research methods in education 
Louis Cohen,; Lawrence Manion,; and Keith Morrison 
 - 5th ed 
 - London:  Routledge;  2000 
<br/><br/><label>ISBN: </label>0415195411 
<br/><br/><label>Dewey Class. No.: </label>370.72  / COH.R