Blalock, H. M. (1972). Casual inferences in nonexperimental research. Norton.
芝加哥风格引文Blalock, Hubert M. Casual Inferences in Nonexperimental Research. New York: Norton, 1972.
MLA引文Blalock, Hubert M. Casual Inferences in Nonexperimental Research. Norton, 1972.
警告：这些引文格式不一定是100％准确.