APA (7th ed.) Citation

Williams, J., Bartlett, P., & Stelbovics, A. (2006). Threshold electron-impact ionization mechanism for hydrogen atoms. The American Physical Society.

Chicago Style (17th ed.) Citation

Williams, J., P. Bartlett, and Andris Stelbovics. Threshold Electron-impact Ionization Mechanism for Hydrogen Atoms. The American Physical Society, 2006.

MLA (9th ed.) Citation

Williams, J., et al. Threshold Electron-impact Ionization Mechanism for Hydrogen Atoms. The American Physical Society, 2006.