- The Open Society and Its Enemies by Karl Popper - Writings on an Ethical Life by Peter Singer - Gödel, Escher, Bach: An Eternal Golden Braid by Douglas R. H

- The Open Society and Its Enemies by Karl Popper - Writings on an Ethical Life by Peter Singer - Gödel, Escher, Bach: An Eternal Golden Braid by Douglas R. Hofstadter - Arguably: Essays by Christopher Hitchens