References
- Edwards, Allen L., Experimental Design in Psychological Research (New York: Rinehart and Company, Inc., 1950), pp. 232–233, 251, 254–256.
- Johnson, Palmer O., Statistical Methods in Research (New York: Prentice Hall, Inc., 1949), p. 282.
- Lindquist, E. F., Design and Analysis of Experiments in Psychology and Education (Boston: Houghton Mifflin Co., 1956), pp. 73, 86.