Wallraff, C. F. (1970). Karl Jaspers: An introduction to his philosophy. Princeton University Press.
Chicago-viite (17. p.)Wallraff, Charles F. Karl Jaspers: An Introduction to His Philosophy. Princeton, N. J: Princeton University Press, 1970.
MLA-viite (9. p.)Wallraff, Charles F. Karl Jaspers: An Introduction to His Philosophy. Princeton University Press, 1970.
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