APA (7th ed.) Citation

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).

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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