reftex-bibliography-commands

reftex-bibliography-commands is a variable defined in `reftex-vars.el'.
Its value is

("bibliography" "nobibliography" "setupbibtex\\[.*?database=" "addbibresource")

• This variable may be risky if used as a file-local variable.

Documentation:
LaTeX commands which specify the BibTeX databases to use with the document.

You can customize this variable.