Hey, I'm currently researching color theory. If you don't mind: Except Realist painter by Gurney, what are some other great resources about color theory that yo

Hey, I'm currently researching color theory. If you don't mind: Except Realist painter by Gurney, what are some other great resources about color theory that you would recommend? My main paper will be about color in marketing. Cheers, and good to see another scholar of colors!