BibTeX started out as a way to format citation databases in LaTeX. It is a nation that lacks an “official” specification but has been around the net slow long that a wide variety of software has been implemented that reads it or writes it.
If you are interested in BibTeX this is a short list of links that, or may not prove useful.
This website also hosts BibTeX versions of the lists provided. BibTeX files are often used with software like LaTeX and JabRef. Many systems like orcid.org can import data in BibTeX form. Below are some sample BibTeX links