APA (7th ed.) Citation

Isham, C. J., Penrose, R., & Sciama, D. W. (1975). Quantum gravity: An Oxford symposium. Clarendon Press.

Chicago Style (17th ed.) Citation

Isham, C. J., Roger Penrose, and D. W. Sciama. Quantum Gravity: An Oxford Symposium. Oxford, [England]: Clarendon Press, 1975.

MLA (9th ed.) Citation

Isham, C. J., et al. Quantum Gravity: An Oxford Symposium. Clarendon Press, 1975.