Faegri, K. <br/><br/>
Principles of pollination ecology 
K. Faegri and L. Vander Pijl 
 - 2nd  ed. 
 - Oxford  Pergamon Press  1971 
 - vii,291p.: ill. ; 22cm. 
<br/><br/><label>Dewey Class. No.: </label>574.5  /  FAE