Leedham, John  <br/><br/>
Programmed learning in the schools 
John Leedham and Derick Unwin 
 - second edition 
 - London:   Longman Group,   1971. 
 - xx, 140 pages :    illustrations ;    20 cm. 
<br/><br/>Bibliography: pages 133-134. 
<br/><br/><label>ISBN: </label>0582320917 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Programmed instruction