Langdon, Danny G. <br/><br/>
The audio-workbook / 
Denny G. Langdon. 
 - Englewood Cliffs :  Educational Technology Publications,  1978. 
 - ix, 61 p. ;  24 cm. 
 - Instructional design library ;  v. 5 .
<br/><br/>Bibliography: p. 61. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0877781095 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual education.