Gray, D E <br/><br/>
Planning visual media for self-instruction.  [electronic resource] 

 -  Journal of biological photography  Jul 1980 
 - 117-37 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0274-497X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audiovisual Aids<br/>Educational Measurement<br/>Humans<br/>Learning<br/>Programmed Instructions as Topic<br/>Time Factors