Cita APA (7a ed.)

Viergever, R. F., Karam, G., Reis, A., & Ghersi, D. (2014). The quality of registration of clinical trials: Still a problem. Public Library of Science (PLoS).

Cita Chicago Style (17a ed.)

Viergever, Roderik F., Ghassan Karam, Andreas Reis, y Davina Ghersi. The Quality of Registration of Clinical Trials: Still a Problem. Public Library of Science (PLoS), 2014.

Cita MLA (8a ed.)

Viergever, Roderik F., et al. The Quality of Registration of Clinical Trials: Still a Problem. Public Library of Science (PLoS), 2014.