* Leonardo da Vinci's Ethical Vegetarianism* The Notebooks of Leonardo da Vinci* Leonardo da Vinci at BBC Science* Yahoo news, 500-year-old Leonardo da Vinci sculpture 'Horse and Rider' unveiled* Leonardo da Vinci: Anatomist The Queen's Gallery, Buckingham Palace, Friday, 4 May 2012 to Sunday, 7 October 2012.
* chapter "The Graphic Works" is by Frank Zollner & Johannes Nathan.