Witness: The Tour (Czech Wikipedia)

Analysis of information sources in references of the Wikipedia article "Witness: The Tour" in Czech language version.

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broadwayworld.com

TV News Desk. Katy Perry Adds Additional Australian Dates for WITNESS Tour. BWW Music World. Dostupné online [cit. 2017-08-31]. (anglicky)

Katy Perry at Estadio Ciudad de La Plata (Estadio Único) (13 Mar 2018). Songkick [online]. [cit. 2017-11-05]. Dostupné online. (anglicky) ^{[nedostupný zdroj]}

PERRY, KATY. @@katyperry [online]. 2017-08-23 [cit. 2017-08-31]. Dostupné online.

KeyBank Center - Buffalo's Premier Entertainment Facility. www.keybankcenter.com [online]. [cit. 2017-08-31]. Dostupné v archivu pořízeném dne 2017-09-07. (anglicky)
Katy Perry – Cancelled - Time Warner Cable Arena. www.timewarnercablearena.com [online]. [cit. 2017-08-06]. Dostupné v archivu pořízeném dne 2017-08-05.