Higgins, J.. <br/><br/>
Guide to Language Laboratory Material Writing /  

 - 1st ed /  
 - Oslo :   Universitetsforlaget ,   2010 
 - p.173 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Writing Materials
<br/><br/><label>Dewey Class. No.: </label>P111  / K9H