Bullough, Robert V. <br/><br/>
Creating instructional materials / 
Robert V. Bullough, Sr. 
 - 2nd ed. 
 - Columbus :  Merrill,  1978. 
 - ix, 278 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0675083613 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching--Aids and devices.<br/>Audio-visual materials.