1. Araki, Ma., The Morphological Study of Peripheral Nerves (in Japanese). J. Jap. Path. Soc. (1955).
2. Alexander, A. M., Textbook of Histology. 5th Edit. 1948. W. B. Saunders Company, Philadelphia & London.
3. Asai, Sh., The law of Dual Sensory Innervation of Viscera (in Japanese). Kyoto Igaku Zasshi,23 (1926), 24.
4. Andrezejewski, C., Zschr. Zellforsch.39 (1953).
5. Bailey, Bailey's Textbook of Histology. 10th Edit. 1940. The Williams & Wilkins Company, Baltimore.