APA (7th ed.) Citation

Hubble, E. P. (1934). Red-shifts in the spectra of nebulae. The Clarendon Pr.

Chicago Style (17th ed.) Citation

Hubble, Edwin Powell. Red-shifts in the Spectra of Nebulae. Oxford: The Clarendon Pr, 1934.

MLA (9th ed.) Citation

Hubble, Edwin Powell. Red-shifts in the Spectra of Nebulae. The Clarendon Pr, 1934.

Warning: These citations may not always be 100% accurate.