Spengler, J. J., & Duncan, O. D. (1956). Demographic analysis: Selected readings. Free Press.
芝加哥风格引文Spengler, Joseph John, 与 Otis Dudley Duncan. Demographic Analysis: Selected Readings. Glencoe, Ill: Free Press, 1956.
MLA引文Spengler, Joseph John, 与 Otis Dudley Duncan. Demographic Analysis: Selected Readings. Free Press, 1956.
警告：这些引文格式不一定是100％准确.