Olafson, F. A. (1967). Principles and Persons: An Ethical Interpretation of Existentialism. Johns Hopkins Press.
芝加哥风格引文Olafson, Frederick A. Principles and Persons: An Ethical Interpretation of Existentialism. Baltimore: Johns Hopkins Press, 1967.
MLA引文Olafson, Frederick A. Principles and Persons: An Ethical Interpretation of Existentialism. Johns Hopkins Press, 1967.
警告：这些引文格式不一定是100％准确.