↑ "Zi" (子; "Tzu" in Wade-Giles transliteration) was used as a suffix for the family name of a respectable man in ancient Chinese culture. It is a rough equivalent to "Sir" and is commonly translated into English as "Master".
↑ Griffith, Samuel B. The Illustrated Art of War. 2005. Oxford University Press. p. 17, 141-143.
↑ Sawyer, Ralph D. The Seven Military Classics of Ancient China. New York: Basic Books. 2007. p. 149.
↑ Giles, Lionel The Art of War by Sun Tzu - Special Edition. Special Edition Books. 2007. p. 62.