Charles Darwin (2010). “The Works of Charles Darwin, Volume 7: The Geology of the Voyage of the H. M. S. Beagle, Part I: Structure and Distribution of Coral Reefs”, p.3, NYU Press
Solomon Northup, Harriet Beecher Stowe (2014). “Twelve Years A Slave: illustrated Original Edition With Bonus of Uncle Tom's Cabin”, p.87, Ageless Reads