To cite kits in publications use:

  Tsai J (2026). _kits: Psychometric Tools for the Kids in Taiwan
  Developmental Scale_. R package version 0.25.2.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {kits: Psychometric Tools for the Kids in Taiwan Developmental Scale},
    author = {Jie-Wen Tsai},
    year = {2026},
    note = {R package version 0.25.2},
  }