Ward, Ritchie R. <br/><br/>
The living clocks / 
Richie R. Ward. 
 - London :  Collins,  1972. 
 - 319 p. 
<br/><br/><label>ISBN: </label>000211481X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biological rhythms.