GRANT, Christopher. id Software looking to shorten dev cycles, stop building new engines for every game. Joystiq [online]. AOL, 2011-08-09 [cit. 2022-08-06]. Dostupné varchivu pořízeném zoriginálu dne2011-08-28. (anglicky)
GNEITING, Axel. My Vulkan Quake 1 Port running "In the Shadows" mod. Some stuff still missing. Code is here https://github.com/Novum/vkQuake. Twitter [online]. 2016-07-20 [cit. 2022-08-05]. Dostupné online. (anglicky)
GRANT, Christopher. id Software looking to shorten dev cycles, stop building new engines for every game. Joystiq [online]. AOL, 2011-08-09 [cit. 2022-08-06]. Dostupné varchivu pořízeném zoriginálu dne2011-08-28. (anglicky)