1. Giardia sp.: Physical factors of excystation in vitro, and excystation vs eosin exclusion as determinants of viability
2. Detection of cysts of Endamoeba histolytica in tap water by the use of membrane filters;Chang;American Journal of Hygiene,1956
3. Davies R. B. & Hibler C. P. (1979). Animal reservoirs and cross-species transmission of Giardia.In Waterborne Transmission of Giardiasis. Proceedings of a symposium,September 1978, EPA – 600/9–79–001, p. 104.
4. A focus of human fascioliasis in the Nile Delta, Egypt;Farag;The Journal of Tropical Medicine and Hygiene,1979