Bausum, A. (2013). Our country's Presidents: All you need to know about the presidents, from George Washington to Barack Obama (4th trade ed.). National Geographic.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bausum, Ann. Our Country's Presidents: All You Need to Know About the Presidents, from George Washington to Barack Obama. 4th trade ed. Washington, D.C.: National Geographic, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bausum, Ann. Our Country's Presidents: All You Need to Know About the Presidents, from George Washington to Barack Obama. 4th trade ed. National Geographic, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.