APA (7th ed.) Citation

Bull, P., & Ferreira, P. (2013). Dark energy and the inhomogeneous universe.

Chicago Style (17th ed.) Citation

Bull, P., and P. Ferreira. Dark Energy and the Inhomogeneous Universe. 2013.

MLA (9th ed.) Citation

Bull, P., and P. Ferreira. Dark Energy and the Inhomogeneous Universe. 2013.

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