Randall, Vernellia R. "History of Tobacco". Boston University Medical Center. University of Dayton. Archived from the original on 17 August 2021. Retrieved 15 September 2021.
Randall, Vernellia R. "History of Tobacco". Boston University Medical Center. University of Dayton. Archived from the original on 17 August 2021. Retrieved 15 September 2021.