1. Spemann, H. & Mangold, H. Über induktion von Embryonalanlagen durch Implantation artfremder Organisatoren. Wilhelm Roux Arch. Entwicklungsmech. Organ. 100, 599–638 (1924).
2. Hamburger, V. A Manual of Experimental Embryology, Revised Edition (Univ. Chicago Press, Illinois, 1960).
3. Hamburger, V. The Heritage of Experimental Embryology. Hans Spemann and the Organizer (Oxford Univ. Press, New York, 1988).An interesting and lively historical account of the events preceding and succeeding the discovery of the organizer, as viewed by a pioneer of experimental embryology and developmental neurobiology.
4. Rugh, R. Experimental Embryology (Burgess, Minneapolis, 1962).
5. Spemann, H. Embryonic Development and Induction (Hafner, New York, 1967).A detailed account of the series of experiments carried out on amphibian embryos in Spemann's laboratory. These experiments defined the process of induction, including neural induction.