Mittler, Peter J. <br/><br/>
The study of twins /  
[by] Peter Mittler. 
 - Harmondsworth :    Penguin,    1971. 
 - 192 p :    ill.    18 cm. 
 - Penguin science of behaviour: abnormal and clinical psychology .
<br/><br/>Includes bibliographical references (p. [172]-186). 
<br/><br/><label>ISBN: </label>014080210X 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Twins.
<br/><br/><label>Dewey Class. No.: </label>155.444