APA (7th ed.) Citation

Regan, A., Bloomfield, L., Peters, I., & Effler, P. (2018). Use text messages to boost flu shots.

Chicago Style (17th ed.) Citation

Regan, Annette, L. Bloomfield, I. Peters, and P. Effler. Use Text Messages to Boost Flu Shots. 2018.

MLA (9th ed.) Citation

Regan, Annette, et al. Use Text Messages to Boost Flu Shots. 2018.