an Entity references as follows:
Of Thee I Sing: A Letter to My Daughters is a 2010 children's book by Barack Obama, with illustrations by Loren Long. It is described by the publisher as a "tribute to thirteen groundbreaking Americans and the ideals that have shaped our nation." The stories of thirteen Americans are told in the book: George Washington, Abraham Lincoln, Martin Luther King Jr., Neil Armstrong, Sitting Bull, Cesar Chavez, Billie Holiday, Maya Lin, Albert Einstein, Georgia O'Keeffe, Jackie Robinson, Helen Keller, and Jane Addams."