APA (7th ed.) Citation

Bowen, R., & Ferreira, P. (2002). The shape of a small universe: Signatures in the cosmic microwave background.

Chicago Style (17th ed.) Citation

Bowen, R., and P. Ferreira. The Shape of a Small Universe: Signatures in the Cosmic Microwave Background. 2002.

MLA (9th ed.) Citation

Bowen, R., and P. Ferreira. The Shape of a Small Universe: Signatures in the Cosmic Microwave Background. 2002.

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