1. A history of Embryology;Needham,1959
2. The development of the heart in man;Waterston;Trans Roy Soc Edin,1918
3. Transformation of the aortic-arch system during the development of the human embryo;Congdon;Contrib Embryol,1922
4. Development of the human heart from its first appearance to the stage found in embryos of 20 paired somites;Davis;Contrib Embryol,1923
5. Developmental horizons in human embryos. Description of age group XI, 13 to 20 somites, and age group XII, 21 to 29 somites;Streeter;Contrib Embryol,1942