Achen, C. H. (1986). The statistical analysis of quasi-experiments. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAchen, Christopher H. The Statistical Analysis of Quasi-experiments. Berkeley, Calif: University of California Press, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAchen, Christopher H. The Statistical Analysis of Quasi-experiments. University of California Press, 1986.
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