1. Embryonic Development and Induction;Spemann,1938
2. The Heritage of Experimental Embryology, Hans Spemann and the Organizer;Hamburger,1988
3. Principles of Development, A Text in Experimental Embryology;Weiss,1939
4. Primary Embryonic Induction;Saxen,1962
5. Experimental Embryology of Echinoderms;Horstadius,1973