Callender, Patricia. <br/><br/>
Programmed learning :  its development and structure / 
Patricia Callender. 
 - London :  Longman Group,  1969. 
 - xii, 120 p.:  ill. (4 plates) ;  23 cm. 
<br/><br/>Bibliography: p. 115-117. 
<br/><br/><label>ISBN: </label>0582410428 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Programmed instruction.