APA aipamena

Eardley, I., Ellis, P., Boolell, M., & Wulff, M. (2002). Onset and duration of action of sildenafil for the treatment of erectile dysfunction. Blackwell Science Inc.

Chicago Style aipamena

Eardley, Ian, Peter Ellis, Mitradev Boolell, and Maria Wulff. Onset and Duration of Action of Sildenafil for the Treatment of Erectile Dysfunction. Blackwell Science Inc, 2002.

MLA aipamena

Eardley, Ian, Peter Ellis, Mitradev Boolell, and Maria Wulff. Onset and Duration of Action of Sildenafil for the Treatment of Erectile Dysfunction. Blackwell Science Inc, 2002.