1. Johns Hopkins Hosp;Mall;Rep,1900
2. Pathology of Fetus and Infant;Potter,1961
3. Contrib;Mall;Embryol.,1931
4. Develpmental Horizons of Human Embryos;Streeter,1951
5. Altman, P., and Dittmer, D.S., editors: Growth Including Reproduction and Morphologic Develpment, Washington, D.C., 1962, Federation of American Societies of Experimental Biology p. 273.