https://katalog.hgb-leipzig.de/Record/0-1641549491 Leonardo da Vinci:
The codex Hammer formerly the codex Leicester / Leonardo da Vinci. Catalogue by Jane Roberts. Introd. by Carlo Pedretti. — [London] : Royal Acad. of Arts, 1981. — 126 S.
ISBN 0384205909, 9780384205901