Cita APA

Barrett, B., Brown, R., Rakel, D., Mundt, M., Bone, K., Barlow, S., & Ewers, T. (2010). Echinacea for treating the common cold: A randomized controlled trial.

Chicago Style Citation

Barrett, Bruce, Roger Brown, Dave Rakel, Marlon Mundt, Kerry Bone, Shari Barlow, i Tola Ewers. Echinacea for Treating the Common Cold: A Randomized Controlled Trial. 2010.

Cita MLA

Barrett, Bruce, et al. Echinacea for Treating the Common Cold: A Randomized Controlled Trial. 2010.