Torshen, Kay Pomerance. <br/><br/>
The mastery approach to competency-based education / 
Kay Pomerance Torshen. 
 - New York :  Academic Press,  1977. 
 - x, 226 p. ;  24 cm. 
 - Educational psychology .
<br/><br/> Includes index. 
<br/><br/>Bibliography : p. 193-224. 
<br/><br/><label>ISBN: </label>012696050X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational psychology.<br/>Individualized instruction.<br/>Grading and marking (Students).