APA (7th ed.) Citation

Helmus, T. C., Chalk, P., & York, E. (2013). Promoting online voices for countering violent extremism. RAND Corporation.

Chicago Style (17th ed.) Citation

Helmus, Todd C., Peter Chalk, and Erin York. Promoting Online Voices for Countering Violent Extremism. [Santa Monica, California?]: RAND Corporation, 2013.

MLA (9th ed.) Citation

Helmus, Todd C., et al. Promoting Online Voices for Countering Violent Extremism. RAND Corporation, 2013.