Barzun, Jacques. Romanticism and the Modern Ego. Boston: Little, Brown, 1943.

Benedict, Ruth. Patterns of Culture. New York: Houghton Mifflin, 1934.

Benn, Alfred William. History of Ancient Philosophy. London: Watts, 1912.

Bridgeman, P. W. The Intelligent Individual and Society. New York: Macmillan, 1938.

Einstein, Albert, and Leopold Infeld. The Evolution of Physics: From Early Concept to Relativity and Quanta. Cambridge: Cambridge University Press, 1938.

Guggenheimer, Samuel H. The Einstein Theory: Explained and Analyzed. New York: Macmillan, 1925.

Heard, Gerald. Pain, Sex and Time: A New Hypothesis of Evolution. London: Cassell, 1939.

Huxley, Aldous. Music at Night. New York: Doubleday, 1931.

_______. Texts and Pretexts. New York: Harper, 1932.

Jung, C. G. Modern Man in Search of a Soul. London: Kegan Paul, Trench, Trubner, 1933.

Kahler, Erich. Man the Measure: A New Approach to History. New York: Pantheon Books, 1943.

Lang, Paul Henry. Music in Western Civilization. New York: W. W. Norton, 1941.

McCabe, Joseph. The Riddle of the Universe To-day. London: Watts, 1934.

*Muller, Herbert Joseph. Science and Criticism: The Humanistic Tradition in Contemporary Thought. New Haven: Yale University Press, 1943.

*Planck, Max. The Philosophy of Physics. New York: W. W. Norton, 1936.

*Plank, Max. Where Is Science Going? New York: W. W. Norton, 1933.

*Reiser, Oliver Leslie. The Philosophy and Concepts of Modern Science. New York: Macmillan, 1935.

Spengler, Oswald. The Decline of the West. New York: Alfred A. Knopf, 1926.

Van Loon, Hendrik Willem. Van Loon's Lives. New York: Simon and Schuster, 1942.

Note: An asterisk denotes the original source of a text that Martinů noted in his diaries, but it is unclear whether he had that source in his possession or he noted the text from a secondary source where that text is also found.