John James Audubon (1831). “Ornithological Biography, Or an Account of the Habits of the Birds of the United States of America: Accompanied by Descriptions of the Objects Represented in the Work Entitled The Birds of America, and Interspersed with Delineations of American Scenery and Manners”, p.7
Harriet Beecher Stowe (2016). “Life of Harriet Beecher Stowe: Compiled From Her Letters and Journals by Her Son Charles Edward Stowe”, p.162, Library of Alexandria