APA (7th ed.) Citation

Barrow, J. D., & Tipler, F. J. (1989). The anthropic cosmological principle. University Press.

Chicago Style (17th ed.) Citation

Barrow, John D., and Frank J. Tipler. The Anthropic Cosmological Principle. Oxford: University Press, 1989.

MLA (9th ed.) Citation

Barrow, John D., and Frank J. Tipler. The Anthropic Cosmological Principle. University Press, 1989.