Smith, M. L., & Glass, G. V. (1987). Research and evaluation in education and the social sciences. Prentice-Hall.

Smith, Mary Lee, and Gene V. Glass. Research and Evaluation in Education and the Social Sciences. Englewood Cliffs, N.J.: Prentice-Hall, 1987.

Smith, Mary Lee, and Gene V. Glass. Research and Evaluation in Education and the Social Sciences. Prentice-Hall, 1987.