1. Drug Trade News: (Apr. 5) 1954.
2. The Tissue Association, Inc.: New York 17, N. Y. (Aug.) 1952.
3. Reported Cases of Specified Notifiable Diseases in United States 1942–1951: Public Health Service, National Office of Vital Statistics; Weekly Morbidity Report, Vol. 12, No. 53, (Feb.) 1953.
4. Craig, C. F. and Faust, E. C.: Clinical Parasitology, pg. 43 (1943).
5. Food Service: Encyclopedia Britannica, Vol. 9, pg. 460 (1953).