Mettler, S., & Lieberman, R. C. (2020). Four threats: The recurring crises of American democracy (First edition.). St. Martin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMettler, Suzanne, और Robert C. Lieberman. Four Threats: The Recurring Crises of American Democracy. First edition. New York, NY: St. Martin's Press, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMettler, Suzanne, और Robert C. Lieberman. Four Threats: The Recurring Crises of American Democracy. First edition. St. Martin's Press, 2020.
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