(Online) Sources for Traditional Lore to Base Creatures on

I'm currently working on a fantasy world with a medieval/mythological setting, and I'm trying to do a bunch of research for several non-human races (dwarves, mermaids, etc.).

However I don't want to simply copy the versions of modern writers/cinema and would like to avoid sources that are based on novels, movies, franchises, video games, etc. (like orcs from Middle Earth or lamia from Monster Musume).

I am looking for a source that contains traditional depictions and mythological lore of non-human creatures.

I'm not asking you to describe different races.

Side note: I'm new here and doing my best to follow this site's rules. I apologize in case the question is wrong or vague and I'm glad for every answer.

• Comments are not for extended discussion; this conversation has been moved to chat. – Monty Wild Oct 8 '19 at 12:42
• If your world contains vampires (and if they are important enough to spend some extra time for research or you maybe want different vampire species), I recommend the book The Secret History of Vampires: Their Multiple Forms and Hidden Purposes by Claude Lecouteux who traces them back to Norse, Chinese, Romanian and Russian Mythology (Maybe your College Library can order/lend that book for free/a small amount - I hope it's the correct English title, I have the German Edition) amazon.com/Secret-History-Vampires-Multiple-Purposes/dp/… – Cee Mon Oct 9 '19 at 12:12

The first place I often start in trying to find out about how so and so author came up with a creature is just googling something like Tolkien dwarves origin and seeing what comes up. If you can at least pinpoint a cultural folklore that the creature came from, you can search your library or worldcat.org for books about that culture's folklore. Start with a survey work, and from there you can follow footnotes to find specific stories about the creatures you're interested in (hopefully translated!)