To cite package ‘nzilbb.vowels’ in publications use:

  Wilson Black J, Brand J, Hay J, Clark L (2023). “Using Principal
  Component Analysis to Explore Co‐variation of Vowels.” _Language and
  Linguistics Compass_, *17*(1), e12479. doi:10.1111/lnc3.12479
  <https://doi.org/10.1111/lnc3.12479>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Using Principal Component Analysis to Explore Co‐variation of Vowels},
    author = {Joshua {Wilson Black} and James Brand and Jen Hay and Lynn Clark},
    journal = {Language and Linguistics Compass},
    year = {2023},
    volume = {17},
    number = {1},
    pages = {e12479},
    doi = {10.1111/lnc3.12479},
  }