King, G., & Wilson, P. (2017). Twilight of empire: The tragedy at Mayerling and the end of the Habsburgs (First edition.). St. Martin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKing, Greg, और Penny Wilson. Twilight of Empire: The Tragedy at Mayerling and the End of the Habsburgs. First edition. New York: St. Martin's Press, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKing, Greg, और Penny Wilson. Twilight of Empire: The Tragedy at Mayerling and the End of the Habsburgs. First edition. St. Martin's Press, 2017.
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