/sci/ - Science & Math

Tex idiot here. I have a few .tex files that contain short abstracts, and each of them has its own bibliography. All of them are articles (in terms of document class).

I was trying to compile them into a short booklet, but because of the formatting I want I'd need to define it as a book, and just including the previous .tex files completely messes up the formatting (regardless of whether I do it with /input or /include) so that's not good. I'm now trying to create a new environment to contain the abstracts and some other information, and that was going reasonably well but I don't know how to handle the bibliography now. The only option I could think of is manually entering each reference into a global .bib file and then using keywords to print them below their respective articles. But that sounds like it could take forever, so I wanna know if there's a better workaround. Does anyone know how I can handle bibliography when I'm working with several files, so I can print the references right after the content of each .tex?

In general, is there a better way to just compile all these articles into a booklet while mostly preserving the formatting (that doesn't involve compiling them into pdfs and inserting the pdf files instead)?
pic unrelated