To cite getspres in publications use:

  Lerato E. Magosi, Jemma C. Hopewell, Martin Farrall (2018). SPRE
  Statistics for Exploring Heterogeneity in Meta-Analysis. R package
  version 0.1.0 URL https://magosil86.github.io/getspres/

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {SPRE Statistics for Exploring Heterogeneity in Meta-Analysis {getspres}},
    author = {Lerato E. Magosi and Jemma C. Hopewell and Martin Farrall},
    year = {2018},
    note = {R package version 0.1.0},
    url = {https://magosil86.github.io/getspres/},
  }