Kumar, S., Dwivedi, V., Pandey, U., Bala, N., Vasandani, S., Singh, K., & Chaudhry, K. (2011). Tobacco use in Northern India–Part 1: The detailed habit. J Oral Biol Craniofac Res.

Kumar, Sandeep, Varsha Dwivedi, Upendra Pandey, Nidhi Bala, Sheela Vasandani, Kamlesh Singh, e Kishore Chaudhry. "Tobacco Use in Northern India–Part 1: The Detailed Habit." J Oral Biol Craniofac Res 2011.

Kumar, Sandeep, et al. "Tobacco Use in Northern India–Part 1: The Detailed Habit." J Oral Biol Craniofac Res 2011.