Gaya APA

El-Nashar, S, A. et al (2015). Pictorial blood loss assessment chart for quantification of menstrual blood loss: a systematic review (Gynecol Surg (2015) 12:157–163). USA: Springer.

Gaya MLA

El-Nashar, Sherif, A.. et al. "Pictorial blood loss assessment chart for quantification of menstrual blood loss: a systematic review". Gynecol Surg (2015) 12:157–163 USA: Springer, 2015. Text.