1. Batson, O. V.: Personal communications.
2. Bevilaqua, S., and Keller, G. J.: The Blood Supply to the Periodontal Ligament of the Albino Rat. (Unpublished.)
3. Histopathologic Technic;Lillie,1948
4. Pathological Technique;Mallory,1938
5. Mikroscopische Technik;Romeis,1948