APA (7th ed.) Citation

Evans, N., Ferrer, F., & Sarkar, S. (2003). Clustering of ultrahigh energy cosmic rays and their sources.

Chicago Style (17th ed.) Citation

Evans, N., F. Ferrer, and S. Sarkar. Clustering of Ultrahigh Energy Cosmic Rays and Their Sources. 2003.

MLA (9th ed.) Citation

Evans, N., et al. Clustering of Ultrahigh Energy Cosmic Rays and Their Sources. 2003.