APA (7th ed.) Citation

Hubble, E. (1936). The realm of the nebulae. Yale university press; H. Milford, Oxford university press.

Chicago Style (17th ed.) Citation

Hubble, Edwin. The Realm of the Nebulae. New Haven : London: Yale university press; H. Milford, Oxford university press, 1936.

MLA (9th ed.) Citation

Hubble, Edwin. The Realm of the Nebulae. Yale university press; H. Milford, Oxford university press, 1936.