Freund, P. A. (1972). Experimentation with human subjects. Allen and Unwin.
芝加哥风格引文Freund, Paul A. Experimentation with Human Subjects. London: Allen and Unwin, 1972.
MLA引文Freund, Paul A. Experimentation with Human Subjects. Allen and Unwin, 1972.
警告：这些引文格式不一定是100％准确.