APA (7 वां संस्करण) प्रशस्ति पत्र

Friedrich, C. J. (1968). Trends of federalism in theory and practice. Praeger.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Friedrich, Carl Joachim. Trends of Federalism in Theory and Practice. New York: Praeger, 1968.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Friedrich, Carl Joachim. Trends of Federalism in Theory and Practice. Praeger, 1968.