Bick, Hartmut. <br/><br/>
Ciliated protozoa :  an illustrated guide to the species used as biological indicators in freshwater biology. 

 - Geneva :  World Health Organization,  1972. 
<br/><br/>Bibliography: p. 189-191. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>LCCN: </label>73162715 
<br/><br/><label>Nat. Bib. No.: </label>Sw*** 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciliata -- Identification.--Ciliata -- Identification.<br/>Indicators (Biology)
<br/><br/><label>LC Class. No.: </label>QL368.A22  / B5 
<br/><br/><label>Dewey Class. No.: </label>593/.172