Cita APA (7a ed.)

Stead, L., Lancaster, T., & Silagy, C. (2001). Updating a systematic review--what difference did it make? Case study of nicotine replacement therapy.

Cita Chicago Style (17a ed.)

Stead, L., T. Lancaster, y C. Silagy. Updating a Systematic Review--what Difference Did It Make? Case Study of Nicotine Replacement Therapy. 2001.

Cita MLA (9a ed.)

Stead, L., et al. Updating a Systematic Review--what Difference Did It Make? Case Study of Nicotine Replacement Therapy. 2001.