Research methodology :  in the life, behavioural and social sciences / 
edited by, Herman J. Ader and Gideon J. Mellenbergh. 
 - London :  Sage Publication,  1999. 
 - 393 p. :  ill. ;  24 cm. 
<br/><br/>Refences : p. 352-380. 
<br/><br/><label>ISBN: </label>0761958843  RM138.54 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Methodology.<br/>Social sciences--Research--Methodology.<br/>Life sciences--Research--Methodology.<br/>Research--Methods.