Walker, Martha L.  <br/><br/>
Index-catalogue of medical and veterinary zoology. Supplement 18, part 6, Parasite-subject catalogue: Subject Headings and Treatment / 
Martha L. Walker etc.; United States Department of Agriculture; Animal Parasitology Institute; Agriculture Resaearch Service. 
 - Supplement 18, part 6, Parasite-subject catalogue: Subject Headings and Treatment 
 - Washington :   U.S. Government printing Office,   1973.