- Healey, Robert M. "Thomas Jefferson's `Wall': Absolute or Serpentine?" Equal Separation: Understanding the Religion Clauses of the First Amendment. ed. Paul J. Weber. New York, NY: Greenwood Press, 1990: pp. 123-148.
- Levy, Leonard W. The Establishment Clause: Religion and the First Amendment, 2nd ed. Chapel Hill: University of North Carolina Press, 1994.
- Pfeffer, Leo. Religion, State, and the Burger Court. Buffalo, NY:Prometheus Books, 1985.
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