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  1. 1 2 3 Waits 2014.Lỗi sfn: không có mục tiêu: CITEREFWaits2014 (trợ giúp)
  2. 1 2 Waits 2013.Lỗi sfn: không có mục tiêu: CITEREFWaits2013 (trợ giúp)
  3. ↑ Frederic Kampfe, Otto F. Kampfe, "Safety-Razor", US patent 228904, issued 1880-June-15
  4. ↑ King C. Gillette, "Razor", US patent 775134, issued 1904-November-15
  5. ↑ McKibben, Gordon (1998). Cutting Edge: Gillette's Journey to Global Leadership. Harvard Business School Press. tr. 429. ISBN 0-87584-725-0.
  6. ↑ Waits, Robert K. (2009). Before Gillette: The Quest for a Safe Razor. J*IV*IX Publication. tr. 264. ISBN 978-0-557-05910-2.

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