Grace, R <br/><br/>
Effects of unsignaled delay of reinforcement on preference and resistance to change.  [electronic resource] 

 -  Journal of the experimental analysis of behavior  May 1998 
 - 247-61 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0022-5002 
<br/><br/><label>Standard No.: </label>10.1901/jeab.1998.69-247  doi