Research design in counseling / 
P. Paul Heppner...[et al.] 
 - 4th ed. 
 - Boston, MA :  Cengage Learning,  2015 
 - xx, 620 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>ISBN: </label>9781305087316 (hbk.) 1305087313 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychology--Psychotherapy--Counseling<br/>Counseling<br/>Counseling--Research--Methodology