To cite package ‘PUPAK’ in publications use:

  Magalong J, DelaCruz J, Bumatay J, Deocaris C (2022). _PUPAK:
  Parameter Estimation, and Plot Visualization of Adsorption Kinetic
  Models_. R package version 0.1.1,
  <https://CRAN.R-project.org/package=PUPAK>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PUPAK: Parameter Estimation, and Plot Visualization of Adsorption
Kinetic Models},
    author = {Jeff Ryan Magalong and Joshua DelaCruz and Jeann Bumatay and Chester Deocaris},
    year = {2022},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=PUPAK},
  }