Sheldon, Leslie E <br/><br/>
ELT textbooks and materials: problems in evaluation and development / 
Sheldon, Leslie E. 
 - London:  Modern english publications,  1987. 
 - 1987 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0906149967 
<br/><br/><label>Dewey Class. No.: </label>420.7 ELT