"Action Star Donnie Yen Talks DRAGON, Why He Turned Down THE EXPENDABLES 2, Period Versus Modern, Whether Breaking Out in the U.S. is a Goal, and More". Interview with Bill Graham, collider.com. November 29, 2012.
Friedrich Melchior Freiherr von Grimm, Denis Diderot (1815). “Historical & Literary Memoirs and Anecdotes, Selected from the Correspondence of Baron de Grimm and Diderot with the Duke of Saxe-Gotha, and Many Other Distinguished Persons, Between the Years of 1753 and 1790”, p.68