FOTO: Wikimedia commons, Prazak 2006, licence Creative Commons Attribution-Share Alike 3.0 Unported, dostupné z: https://commons.wikimedia.org/wiki/File:Opo%C4%8Dno_-_z%C3%A1meck%C3%A9_n%C3%A1dvo%C5%99%C3%AD.jpg
FOTO: Wikimedia commons, Prazak 2006, licence Creative Commons Attribution-Share Alike 3.0 Unported, dostupné z: https://commons.wikimedia.org/wiki/File:Opo%C4%8Dno_-_z%C3%A1meck%C3%A9_n%C3%A1dvo%C5%99%C3%AD.jpg
