New study disproves Leonardo da Vinci's 'rule of trees'. phys.org [online]. [cit. 2023-09-19]. Dostupné online.
theguardian.com
JONES, Jonathan. Leonardo da Vinci unleashed: the animal rights activist within the artist. the Guardian [online]. 2011-11-30 [cit. 2018-02-25]. Dostupné online. (anglicky)
thoughtco.com
Was Leonardo da Vinci a Vegetarian?. ThoughtCo. Dostupné online [cit. 2018-02-25].