APA aipamena

Shakir, S. A. W., Wilton, L. V., Boshier, A., Layton, D., & Heeley, E. (2001). Cardiovascular events in users of sildenafil: Results from first phase of prescription event monitoring in England. BMJ.

Chicago Style aipamena

Shakir, Saad A W., Lynda V. Wilton, Andrew Boshier, Deborah Layton, and Emma Heeley. Cardiovascular Events in Users of Sildenafil: Results From First Phase of Prescription Event Monitoring in England. BMJ, 2001.

MLA aipamena

Shakir, Saad A W., et al. Cardiovascular Events in Users of Sildenafil: Results From First Phase of Prescription Event Monitoring in England. BMJ, 2001.