Buffie, E. G., Welch, R. C., & Paige, D. D. (1968). Mathematics; strategies of teaching. Prentice-Hall.

Buffie, Edward G., Ronald C. Welch, and Donald D. Paige. Mathematics; Strategies of Teaching. Englewood Cliffs, N.J.: Prentice-Hall, 1968.

Buffie, Edward G., et al. Mathematics; Strategies of Teaching. Prentice-Hall, 1968.