Cita APA (7th ed.)

Bull, P., & Kamionkowski, M. (2013). What if Planck's Universe isn't flat?

Cita Chicago (17th ed.)

Bull, P., i M. Kamionkowski. What If Planck's Universe Isn't Flat? 2013.

Cita MLA (9th ed.)

Bull, P., i M. Kamionkowski. What If Planck's Universe Isn't Flat? 2013.

Atenció: Aquestes cites poden no estar 100% correctes.