Seligman, E.R.A. et al.   ed. <br/><br/>
Encyclopedia of Social Sciences   

 - New York  Macmillan  1967 
 - v.p. 
 - .
<br/><br/> "Lib.has : V.1-2, pp696; V.3-4, pp710; V.5-6, pp713; V.7-8, pp713; V.9-10, pp652; V.11-12, pp716; V.13-14, pp676; V.15