Bartnik, Krzysztof (14 February 2003). "Poważny Sam w złotej koszulce" [Serious Sam in a golden shirt]. Gry-Online (in Polish). Archived from the original on 26 September 2021. Retrieved 21 August 2023.
Bartnik, Krzysztof (14 February 2003). "Poważny Sam w złotej koszulce" [Serious Sam in a golden shirt]. Gry-Online (in Polish). Archived from the original on 26 September 2021. Retrieved 21 August 2023.