You do not have to give me (Dorian Zgraggen) attribution when using the textures. You can use them commercially as well as non-commercially. The textures are licensed as CC0, which means you can use them for any purpose. The textures don’t belong to me anymore, they belong to the public. If you want to learn more about this license, click here.
If you enjoy using the textures, please consider supporting cgbookcase.com on Patreon. It really helps me out.