APA (7th ed.) Citation

Underhill, R. G., Uprichard, E. A., & Heddens, J. W. (1980). Diagnosing Mathematical difficulties. Charles E.Merrill.

Chicago Style (17th ed.) Citation

Underhill, Robert G., Edward A. Uprichard, and James W. Heddens. Diagnosing Mathematical Difficulties. Columbus,[Ohio]: Charles E.Merrill, 1980.

MLA (9th ed.) Citation

Underhill, Robert G., et al. Diagnosing Mathematical Difficulties. Charles E.Merrill, 1980.