Citations
Insert Citation (Insert menu, or the palette) lists the entries of the
files #+BIBLIOGRAPHY: names (BibTeX, BibLaTeX or CSL-JSON, beside the
document or anywhere); typing narrows the list by key, author and title,
and Enter writes [cite:@key], or adds ; @key when the cursor is in a
citation already. With the cursor on a citation's key, the status bar
shows the entry it cites, or that no bibliography has it; in the
graphical editor, so does a tooltip under the mouse.