1. Determination of age of embryos;Arey,1965
2. Anatomia Humani Corporis;Bidloo,1685
3. The early stages of human limb development;Blechschmidt,1969
4. Studies on papillary pattern of human fingers;Bonnevie;J. Genet.,1924
5. Recherches nouvelles sur les dessins papillaires des doigts humains;Bonnevie;Bull. Soc. d'Etudes des Formes Humaines,1929