Emamhadi, M., and M. Jalilvand. “Predictors of Paan, Nass and Gutka (Oral Tobacco) Use Among University Students”. International Journal of Medical Toxicology and Forensic Medicine, vol. 2, no. 2(spring), Sept. 2012, pp. 50-55, doi:10.22037/ijmtfm.v2i2(spring).3255.