Glass, G. V., & Hopkins, K. D. (1984). Statistical methods in education and psychology (2nd ed.). Prentice-Hill, Inc.

Glass, Gene V., and Kenneth D. Hopkins. Statistical Methods in Education and Psychology. 2nd ed. New Jersey: Prentice-Hill, Inc, 1984.

Glass, Gene V., and Kenneth D. Hopkins. Statistical Methods in Education and Psychology. 2nd ed. Prentice-Hill, Inc, 1984.