APA (7th ed.) Citation

Unruh, W. G., & Semenoff, G. W. (1987). The Early Universe. Springer Netherlands.

Chicago Style (17th ed.) Citation

Unruh, W. G., and G. W. Semenoff. The Early Universe. Dordrecht: Springer Netherlands, 1987.

MLA (9th ed.) Citation

Unruh, W. G., and G. W. Semenoff. The Early Universe. Springer Netherlands, 1987.