Doerr, A. (2007). Four seasons in Rome: On twins, insomnia, and the biggest funeral in the history of the world. Scribner.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Doerr, Anthony. Four Seasons in Rome: On Twins, Insomnia, and the Biggest Funeral in the History of the World. New York: Scribner, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Doerr, Anthony. Four Seasons in Rome: On Twins, Insomnia, and the Biggest Funeral in the History of the World. Scribner, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.