Dick, Walter. <br/><br/>
Topics in measurement :  reliability and validity / 
Walter Dick , Nancy Hagerty. 
 - New York :  McGraw-Hill Book Co.,  c1971. 
 - vii, 190 p. :  ill. ;  20 cm. 
<br/><br/>Includes bibliographical references (p. 181-184) and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics.
<br/><br/><label>Dewey Class. No.: </label>530.8 DIC