How do I cite a source with multiple authors in Chicago style?

In a Chicago style footnote, list up to three authors. If there are more than three, name only the first author, followed by “et al.

In the bibliography, list up to ten authors. If there are more than ten, list the first seven followed by “et al.”

Full note Short note Bibliography
2 authors Anna Burns and Robert Smith Burns and Smith Burns, Anna, and Robert Smith.
3 authors Anna Burns, Robert Smith, and Judith Green Burns, Smith, and Green Burns, Anna, Robert Smith, and Judith Green.
4+ authors Anna Burns et al. Burns et al. Burns, Anna, Robert Smith, Judith Green, and Maggie White.

The same rules apply in Chicago author-date style.