Faegri, Knut. <br/><br/>
The principles of pollination ecology / 
by K. Faegri and L. van der Pijl. 
 - 3rd rev. ed. 
 - Oxford :  Pergamon Press,  c1979. 
 - xi, 244 p. :  ill. 
 - Pergamon international library of science, technology, engineering, and social studies .
<br/><br/><label>ISBN: </label>0080213383  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollination.<br/>Plant ecology