Ackroyd, P. (2012). Foundation: The history of England from its earliest beginnings to the Tudors (1st U.S. ed.). Thomas Dunne Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ackroyd, Peter. Foundation: The History of England from Its Earliest Beginnings to the Tudors. 1st U.S. ed. New York: Thomas Dunne Books, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ackroyd, Peter. Foundation: The History of England from Its Earliest Beginnings to the Tudors. 1st U.S. ed. Thomas Dunne Books, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.