International directory of programmed instruction. 

 - Paris :  UNESCO,  c 1973. 
 - 191 p. ;  24 cm. 
<br/><br/>334  334 
<br/><br/><label>ISBN: </label>92-3-001102-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Methods of instruction and study.
<br/><br/><label>Dewey Class. No.: </label>371.39 / I8