Robles, E <br/><br/>
An inexpensive 10-digit printout counter.  [electronic resource] 

 -  Journal of the experimental analysis of behavior  Jul 1985 
 - 127-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0022-5002 
<br/><br/><label>Standard No.: </label>10.1901/jeab.1985.44-127  doi