APA (7th ed.) Citation

Robertson, H. P., & Noonan, T. W. (1968). Relativity and cosmology. Saunders.

Chicago Style (17th ed.) Citation

Robertson, H. P., and Thomas W. Noonan. Relativity and Cosmology. Philadelphia: Saunders, 1968.

MLA (9th ed.) Citation

Robertson, H. P., and Thomas W. Noonan. Relativity and Cosmology. Saunders, 1968.