Hartmann, D P <br/><br/>
On the not so recent invention of interobserver reliability: A commentary on two articles by Birkimer and Brown.  [electronic resource] 

 -  Journal of applied behavior analysis  1979 
 - 559-60 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0021-8855 
<br/><br/><label>Standard No.: </label>10.1901/jaba.1979.12-559  doi