Bausum, A. (2013). Our country's Presidents: All you need to know about the presidents, from George Washington to Barack Obama (4th library edition.). National Geographic Society.
Citazione stile Chigago Style (17a edizione)Bausum, Ann. Our Country's Presidents: All You Need to Know About the Presidents, from George Washington to Barack Obama. 4th library edition. Washington, D.C: National Geographic Society, 2013.
Citatione MLA (9a ed.)Bausum, Ann. Our Country's Presidents: All You Need to Know About the Presidents, from George Washington to Barack Obama. 4th library edition. National Geographic Society, 2013.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.