To cite package ‘nipals’ in publications use:

  Wright K (2021). _nipals: Principal Components Analysis using NIPALS
  or Weighted EMPCA, with Gram-Schmidt Orthogonalization_. R package
  version 0.9, <https://github.com/kwstat/nipals>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nipals: Principal Components Analysis using NIPALS or Weighted EMPCA,
with Gram-Schmidt Orthogonalization},
    author = {Kevin Wright},
    year = {2021},
    note = {R package version 0.9},
    url = {https://github.com/kwstat/nipals},
  }