APA (7th ed.) Citation

Clark, E., Krushelnick, K., Zepf, M., Tatarakis, M., Beg, F., Norreys, P., & Dangor, A. (2006). Clark et al. Reply.

Chicago Style (17th ed.) Citation

Clark, E., K. Krushelnick, M. Zepf, M. Tatarakis, F. Beg, P. Norreys, and A. Dangor. Clark Et Al. Reply. 2006.

MLA (9th ed.) Citation

Clark, E., et al. Clark Et Al. Reply. 2006.