Personal effectiveness :  guiding people to assert themselves andimprove their social skills / 
R. P. Liberman ...[et al.]. 
 - Champaign, Ill. :  Research Press,  1975. 
<br/><br/><label>Subjects--Index Terms: </label>ფსიქოლოგია ზოგადი ფსიქოტექნიკა