Penrose, L. S. (Lionel Sharples) <br/><br/>
The biology of mental defect / 
with a preface by J.B.S. Haldane ; completely revised with the assistance of J.M. Berg and Helen Lang-Brown. 
 - [4th ed.]. 
 - London :  Sidgwick & Jackson,  [1972] 
<br/><br/>Bibliography: p. 297-338. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medical genetics.<br/>Mentally handicapped.<br/>Medical genetics.