To cite package ‘rk.apyramid’ in publications use:

  Cano A (2026). _rk.apyramid: High-performance Age pyramids for Data
  Frames and Survey objects using SWD principles._. R package version
  0.1.3, <https://github.com/alfcano/rk.apyramid>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rk.apyramid: High-performance Age pyramids for Data Frames and Survey objects
using SWD principles.},
    author = {Alfonso Cano},
    year = {2026},
    note = {R package version 0.1.3},
    url = {https://github.com/alfcano/rk.apyramid},
  }