Ackroyd, P. (2012). Foundation: The history of England from its earliest beginnings to the Tudors (1st U.S. ed.). Thomas Dunne Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAckroyd, Peter. Foundation: The History of England from Its Earliest Beginnings to the Tudors. 1st U.S. ed. New York: Thomas Dunne Books, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAckroyd, Peter. Foundation: The History of England from Its Earliest Beginnings to the Tudors. 1st U.S. ed. Thomas Dunne Books, 2012.
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