1. Ryle, G., The Concept of Mind, London, 1949.
2. Watanabe, S., Annals of Japan Assoc. for Philosophy of Science, I, 4, p. 12.
3. Watanabe, S., Louis de Broglie, physicien et penseur, (éd. André George), Paris, Albin Michel, 1952, p. 385.
4. Wigner, E. P., A lecture entitled Two Kinds of Reality, presented at Marquette University, June 1961 (to be published).
5. Watanabe, S., Dimensions of Mind, (ed. Siney Hook), New York University Press, New York, 1960, p. 143.