Clear and Present Danger
Dow, David R., and R. Scott Shieldes. 1998. "Rethinking the Clear and Present Danger Test." Indiana Law Journal 73 (fall): 1217–46.
Elliott, Stephen P., ed. 1986. A Reference Guide to the United States Supreme Court. New York: Facts on File.
Hopkins, W. Wat. 1995. "Reconsidering the 'Clear and Present Danger' Test: Whence the 'Marketplace of Ideas'?" Free Speech Yearbook 33.
Levy, Leonard W. 1986. Encyclopedia of the American Constitution. New York: Macmillan.
Schwartz, Bernard. 1994. "Holmes Versus Hand: Clear and Present Danger or Advocacy of Unlawful Action?" Supreme Court Review.
Witt, Elder. 1990. Guide to the U.S. Supreme Court. 2d ed. Washington, D.C.: Congressional Quarterly.