POYRAZOĞLU S., ŞARLI ŞULE, GENCER Z., and GÜNAY O. “Waterpipe (narghile) Smoking Among Medical and Non-Medical University Students in Turkey”. Upsala Journal of Medical Sciences, vol. 115, no. 3, July 2010, pp. 210–216, doi:10.3109/03009734.2010.487164.