Need help finding scholarly sources for a comparison/contrast paper.

I would like to do a comparison/contrast paper on how hollywood takes notable sci-fi novels or any novels really, and just turns them into a cashcrop instead of actually following the plot of the story. My example I would like to use to show that Hollywood has done this is “I am Legend” starring Will Smith.

I need to maybe find some reputable sources about how Hollywood does just this and maybe some articles or essays concerning this movie in particular, etc. Any help would be appreciated. I can’t use regular google or internet sources, only peer reviewed scholarly type stuff. Thanks.