Doss, Mildred A.  <br/><br/>
Index catalogue of medical and veterinary zoology. Trematoda and trematode diseases. Part 7: Supergenera and genera R-S / 
Mildred A. Doss; USA Department of Agriculture. 
 - Part 7: Supergenera and genera R-S 
 - Washington, D.C. :  US Government Printing Office,  1968.