Lehman, H. C., & Witty, P. A. (1927). The psychology of play activities. Barnes.
芝加哥风格引文Lehman, Harvey C., 与 Paul A. Witty. The Psychology of Play Activities. New York: Barnes, 1927.
MLA引文Lehman, Harvey C., 与 Paul A. Witty. The Psychology of Play Activities. Barnes, 1927.
警告：这些引文格式不一定是100％准确.