Penrose, G. (1988). Magic mud and other great experiments. Little Simon.
芝加哥风格引文Penrose, Gordon. Magic Mud and Other Great Experiments. New York: Little Simon, 1988.
MLA引文Penrose, Gordon. Magic Mud and Other Great Experiments. Little Simon, 1988.
警告：这些引文格式不一定是100％准确.