Hartley, James. <br/><br/>
Designing instructional text / 
James Hartley. 
 - 3rd ed. 
 - East Brunswick, NJ :  Nichols Publishing,  1994. 
 - 183 p. :  ill. 
<br/><br/><label>ISBN: </label>0893973998 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Textbooks--Authorship.<br/>Teaching--Aids and devices.<br/>Printing--Style manuals.