Microscopic Anatomy of Invertebrates/  platyhelminthes and nemertinea, volume 3, 
Harrison,Frederick W. [ed.] 
 - Volume 3 
 - New York:  Wiley-Liss,  1991. 
 - 347 
<br/><br/><label>ISBN: </label>0471568430 
<br/><br/><label>Dewey Class. No.: </label>592.04  / HAR/M