Photoperiodism : the biological calendar 
edited by Randy J. Nelson, David L. Denlinger, David E. Somers 
 - Oxford  Oxford University Press  2010 
 - xiii, 581 p. : ill., maps ; 25 cm 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780195335903 
<br/><br/><label>ISSN: </label>2008041919 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biological Clocks - genetics<br/>Biological Clocks - physiology<br/>Photoperiod<br/>Photoperiodism
<br/><br/><label>Dewey Class. No.: </label>612.022 NEL