Singer, M. G. (1980). Is ethics a science? Ought it to be? Zygon, 15(1), 29-42.
芝加哥风格引文Singer, Marcus George. "Is Ethics a Science? Ought It to Be?" Zygon 15, no. 1 (1980): 29-42.
MLA引文Singer, Marcus George. "Is Ethics a Science? Ought It to Be?" Zygon, vol. 15, no. 1, 1980, pp. 29-42.
警告：这些引文格式不一定是100％准确.