1. Der Peitschenwurm ein blutsaugender Parasit;Askanazy;Deutsches Arch. Klin. Med.,1896
2. Chitwood B. G. , AND Chitwood M. B. , 1938.—“An Introduction to Nematology.” Babylon.
3. Zinc in nutrition of the rat;Todd;Amer. J. Physiol.,1934
4. The anatomy and life of Anchylostoma duodenale. Dub;Looss;Rec. Sch. Med. Cairo,1905