Hillman, William S. <br/><br/>
Photoperiodism in plants and animals / 
William S. Hillman. 
 - Burlington :  Carolina Biological Supply Co.,  1979. 
 - 323 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0892783079 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant photoperiodism.<br/>Plants, Effect of temperature on.<br/>Photoperiodism.