APA (7th ed.) Citation

Evelyn, C. J., Money-Coutts, G. B., & Tyrrell, J. A. (1974). The seven circles theorem and other new theorems.

Chicago Style (17th ed.) Citation

Evelyn, C. J., G. B. Money-Coutts, and J. A. Tyrrell. The Seven Circles Theorem and Other New Theorems. London, 1974.

MLA (9th ed.) Citation

Evelyn, C. J., et al. The Seven Circles Theorem and Other New Theorems. 1974.