APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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