Walter, J. E. (1901). The principles of knowledge. The principles of knowledge with remarks on the nature of reality.
芝加哥风格引文Walter, Johnston Estep. "The Principles of Knowledge." The Principles of Knowledge with Remarks on the Nature of Reality 1901.
MLA引文Walter, Johnston Estep. "The Principles of Knowledge." The Principles of Knowledge with Remarks on the Nature of Reality, 1901.
警告：这些引文格式不一定是100％准确.