Ross, S E <br/><br/>
Programmed Instruction.  [electronic resource] 

 -  Science (New York, N.Y.)  Sep 1965 
 - 1047 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.149.3688.1047  doi