ORAVSKY, Vladimir. Mona Lisas leende. [Slottsbron] : FramSteget Bokförlag, 2015. 1 online zdroj (23 stran). Available on Internet: <http://search.mlp.cz/searchMKP.jsp?action=sTitul&key=4204762> <https://web2.mlp.cz/koweb/00/04/20/47/62.jpg> ISBN 978-91-7581-041-6.