To cite package ‘stacking’ in publications use:

  Nukui T, Onogi A (2024). _stacking: Building Predictive Models with
  Stacking_. R package version 0.1.3,
  <https://github.com/onogi/stacking>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {stacking: Building Predictive Models with Stacking},
    author = {Taichi Nukui and Akio Onogi},
    year = {2024},
    note = {R package version 0.1.3},
    url = {https://github.com/onogi/stacking},
  }