Colgan, Patrick W. <br/><br/>
Animal motivation / 
Patrick Colgan 
 - London :  Chapman & Hall,  1989 
 - 159 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0412318504 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Motivation in animals