Duffy, Thomas M., Waller, Robert <br/><br/>
Designing usable texts 

 - New York  Academic Press  1985 
 - xv,423p. 
<br/><br/><label>ISBN: </label>0122232607   
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Methods of instruction<br/>Methods of teaching
<br/><br/><label>Dewey Class. No.: </label>371.33  / DUF