Symbolism. Ed. By F.E. Johnson. New York:
Institute for Religious and Social Studies.
Thomas, E. J.
1935
Early Buddhist Scriptures. London: K. Paul,
Trench, Trubner & Co., Ltd.
Watsuji, Tetsuro
1927
“Genshi Bukkyo no Jissen-tetsugaku.” In Practical
Philosophy of Primitive Buddhism. Tokyo: Iwanami
Shoten.
Yadav, Bibhuti S.
1977
“Negation, Nirvana and Nonsense.” In Journal of
American Academy of Religions. XLV/4.
Yoshinori,
Takeuchi
1991
The Heart of Buddhism: In Search of the Timeless
Spirit of Primitive Buddhism. Ed. and Trans. by
James W. Heisig. New York: Crossroad.