APA (7th ed.) Citation

Houdebine, E., Smith, G., & Jordan, C. (2003). New constraints on the formation of the helium lines.

Chicago Style (17th ed.) Citation

Houdebine, E., G. Smith, and C. Jordan. New Constraints on the Formation of the Helium Lines. 2003.

MLA (9th ed.) Citation

Houdebine, E., et al. New Constraints on the Formation of the Helium Lines. 2003.