↑ Draper, Frank W., A Text-book of Legal Medicine, Philadelphia: W.B. Saunders & Co. (1905), tr. 341–343
↑ Gross, Hans, Criminal Investigation: A Practical Textbook for Magistrates, Police Officers and Lawyers, London: Sweet & Maxwell (1949), tr. 185
↑ Harding, David, and Cann, Jefferson (eds.), Weapons: An International Encyclopedia from 5000 B.C. to 2000 A.D., The Diagram Visual Group, New York: St. Martin's Press/Macmillan, ISBN0-312-03950-6, ISBN978-0-312-03950-9 (1990), tr. 32–33