Kumar, P., D. K. Verma, J. Narayan, P. Kanawjia, and A. Ghildiyal. “Effect of Coffee on Blood Pressure and Electrocardiographic Changes in Nicotine Users”. Asian Journal of Medical Sciences, vol. 6, no. 3, Oct. 2014, pp. 46-48, doi:10.3126/ajms.v6i3.10090.