APA (7th ed.) Citation

Bell, A. W., & O'Brien, D. J. (1980). Solving equations: A teaching experiment. Shell Centre for Math. Education.

Chicago Style (17th ed.) Citation

Bell, Alan W., and Dennis J. O'Brien. Solving Equations: A Teaching Experiment. Nottingham: Shell Centre for Math. Education, 1980.

MLA (9th ed.) Citation

Bell, Alan W., and Dennis J. O'Brien. Solving Equations: A Teaching Experiment. Shell Centre for Math. Education, 1980.