APA (7th ed.) Citation

Clark, P. C., Glover, S., & Klessen, R. S. (2012). How long does it take to form a molecular cloud? Arxiv.

Chicago Style (17th ed.) Citation

Clark, Paul C., Simon Glover, and Ralf S. Klessen. "How Long Does It Take to Form a Molecular Cloud?" Arxiv 2012.

MLA (9th ed.) Citation

Clark, Paul C., et al. "How Long Does It Take to Form a Molecular Cloud?" Arxiv, 2012.