Einstien, Albert. <br/><br/>
Relativity :  the special and the general theory : a popular exposition / 
authorized tr. by Robert W. Lawson. 
 - London :  Methuen,  1962. 
<br/><br/> First published in this trans. in 1920. 
<br/><br/>Bibliography: p. 159-160. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Relativity (Physics)