Metodické materiály k výuce ke Karlu IV. - Karel IV.: Charles_IV_kneeling_before_Madonna-Votive_picture_of_archbishop_Jan_Ocko.jpg
Ejdzej. Wikimedia.org : Charles IV kneeling before Madonna-, fragment of votive picture of Archbishop John Ocko of Vlasim [online]. 2007-03-07 [cit. 2015-10-19]. Dostupný pod licencí Public domain na WWW: <https://commons.wikimedia.org/wiki/File:Charles_IV_kneeling_before_Madonna-Votive_picture_of_archbishop_Jan_Ocko.jpg>.