American economic review 

 - Bisconsin  American Economic Association       1972 
 -  vol.42-2 .
<br/><br/><label>Standard No.: </label>187551 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"V73.M65<-I92r, L2"