Olafson, F. A. (1967). Principles and persons: An ethical interpretation of existentialism. Johns Hopkins Press.
Chicago Style aipamenaOlafson, Frederick A. Principles and Persons: An Ethical Interpretation of Existentialism. Baltimore: Johns Hopkins Press, 1967.
MLA aipamenaOlafson, Frederick A. Principles and Persons: An Ethical Interpretation of Existentialism. Johns Hopkins Press, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.