Koella, Werner P. (Werner Paul),  1917- <br/><br/>
Sleep  its nature and physiological organization / 
by Werner P. Koella. With a foreword by Hudson Hoagland. 
 - Springfield, Ill. :  Thomas,  1967. 
 - 199 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sleep--Physiological aspects.