Norden, R. (1985). Symbols and their meaning. Concordia.
芝加哥风格引文Norden, Rudolf. Symbols and Their Meaning. Louis: Concordia, 1985.
MLA引文Norden, Rudolf. Symbols and Their Meaning. Concordia, 1985.
警告：这些引文格式不一定是100％准确.
APA引文