Cohen, Louis   <br/><br/>
Research methods in education 
Louis Cohen, Lawrence Manion and Keith Morrison  
 - 8th ed. 
 - New York  Routledge  2018 
 - xxvii+915p.  biblio: figs; index; tables 
<br/><br/><label>ISBN: </label>978-0367086398 
<br/><br/><label>Universal Decimal Class. No.: </label>001.82:37  / COH