Popham, W. J., & Baker, E. L. (1973). Classroom instructional tactics. Prentice-Hall.

Popham, W. James, and Eva L. Baker. Classroom Instructional Tactics. Englewood Cliffs, N.J.: Prentice-Hall, 1973.

Popham, W. James, and Eva L. Baker. Classroom Instructional Tactics. Prentice-Hall, 1973.