Keller Fred S. <br/><br/>
Learning : Reinforcement theory 

 - Garden City, USA  Doubleday and Company   1954 
 - 37p. 
 - Dubleday Papers in Psychology .
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education-Learning