APA (7th ed.) Citation

Hayati, P., Firoozeh, N., Potdar, V., & Chai, K. (2012). How much money do spammers make from your website? ACM.

Chicago Style (17th ed.) Citation

Hayati, P., N. Firoozeh, Vidyasagar Potdar, and K. Chai. How Much Money Do Spammers Make from Your Website? ACM, 2012.

MLA (9th ed.) Citation

Hayati, P., et al. How Much Money Do Spammers Make from Your Website? ACM, 2012.