Brown, Lew G.; Hart, Jennifer M. (1992). "Gillette and the Men's Wet-Shaving Market"(PDF). The Case Research Journal. North American Case Research Association. Archived(PDF) from the original on 9 August 2020. Retrieved 17 November 2019 – via The Institute of Chartered Accountants of Sri Lanka.
Brown, Lew G.; Hart, Jennifer M. (1992). "Gillette and the Men's Wet-Shaving Market"(PDF). The Case Research Journal. North American Case Research Association. Archived(PDF) from the original on 9 August 2020. Retrieved 17 November 2019 – via The Institute of Chartered Accountants of Sri Lanka.