Authors:

Learn diligence before speedy execution.

Trevor J. Fairbrother, Chiyo Ishikawa, Leonardo (Da Vinci.) (1997). “Leonardo Lives: The Codex Leicester and Leonardo Da Vinci's Legacy of Art and Science : [catalog of an Exhibition Held at the Seattle Art Museum, October 23, 1997, to January 4, 1998]”, University of Washington Press
Learn diligence before speedy execution.