By default Texts processes bibliographic citations using Citation Style Language (CSL) processor. Export to XeLaTeX format can be changed to use Natbib citations format, which is commonly used in LaTeX documents.
Execute the following command in Terminal app to switch citations format to Natbib.
defaults write io.texts.Texts TSCitationsFormat natbibTo switch back to CSL execute the following command.
defaults write io.texts.Texts TSCitationsFormat citeprocDownload and install one of the following files to switch citations format in XeLaTeX export.