References
- Collins, B.L., and Goodin, PJ. 1991. Visibility of exit directional indicators NISTIR 4532. Gaithersburg, MD: National Institute of Standards and Technology, U.S. Department of Commerce.
- Ishihara, S. 1964. Tests for colour-blindness. Tokyo: Kanehara Shuppan.
- Kennedy, J.M. 1974. A psychology of picture perception. San Francisco: Jossey-Bass.
- Kirk, R.E. 1968. Experimental design: Procedures for the behavioral sciences. Belmont, CA: Brooks/Cole.
- National Fire Protection Association. 1991. NFPA 101 Life Safety Code 1991. Quincy, MA: NFPA.
- Siegel, S. 1965. Nonparametric statistics for the behavioral sciences. New York: McGraw-Hill.