To cite package ‘Rquefts’ in publications use:

  Hijmans R, Pypers P (2024). _Rquefts: Quantitative Evaluation of the
  Native Fertility of Tropical Soils_. R package version 1.2-4,
  <https://CRAN.R-project.org/package=Rquefts>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Rquefts: Quantitative Evaluation of the Native Fertility of Tropical
Soils},
    author = {Robert J. Hijmans and Pieter Pypers},
    year = {2024},
    note = {R package version 1.2-4},
    url = {https://CRAN.R-project.org/package=Rquefts},
  }