APA (7th ed.) Citation

Siraj, A., Chyba, C. F., & Tremaine, S. Orbit of a Possible Planet X. IOP Publishing.

Chicago Style (17th ed.) Citation

Siraj, Amir, Christopher F. Chyba, and Scott Tremaine. Orbit of a Possible Planet X. IOP Publishing.

MLA (9th ed.) Citation

Siraj, Amir, et al. Orbit of a Possible Planet X. IOP Publishing.

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