Primary Reading
“The Precious Key to the Secret Treasury” (秘蔵寶鑰 Hizō hōyaku) in: Kūkai: Major Works, translated, with an account of his life and a study of his thought, by Yoshito S. Hakeda (New York: Columbia University Press), pp. 157-224.
Suggested Reading
Shaner, David Edward. The Body-Mind Experience in Japanese Buddhism: A Phenomenological Study of Kukai and Dogen. Albany; State University of New York Press, 1985