Pennycuick, David. <br/><br/>
The impact of graded text / 
David Pennycuick and Roger Murphy. 
 - London :  The Falmer Press,  1988. 
 - 187 p. ;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>1850002770 
<br/><br/><label>Subjects--Topical Terms: </label><br/>High schools--Examinations.--United Kingdom<br/>Grading and making (Student)--United Kingdom.