Geisler, N. L. (1971). Ethics: Alternatives and issues. Zondervan.
芝加哥风格引文Geisler, Norman L. Ethics: Alternatives and Issues. Grand Rapids: Zondervan, 1971.
MLA引文Geisler, Norman L. Ethics: Alternatives and Issues. Zondervan, 1971.
警告：这些引文格式不一定是100％准确.