Calder, Nigel.
Einstein’s universe: relativity made plain : the amazing achievement of Albert Einstein and what it means today /
Nigel Calder 
. - Harmondsworth : Penguin books,  1980 
. - 254 p.  ill., schem.  18 cm. 
 - (Physics )
<br/><label>  ISBN: </label>0-14-00.5499-5 
<br/><br/><label>Subjects--Personal Names: </label><br/>Einstein, Albert 1879-1955