CHIU, Stephen. Jess Cliffe, co-creater of Counter-Strike explains his side of the story. VPEsports [online]. 2019-03-07 [cit. 2020-03-19]. Dostupné v archivu pořízeném z originálu dne 2020-03-19.
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CHIU, Stephen. Jess Cliffe, co-creater of Counter-Strike explains his side of the story. VPEsports [online]. 2019-03-07 [cit. 2020-03-19]. Dostupné v archivu pořízeném z originálu dne 2020-03-19.