To cite package 'prospectr' in publications use:

Stevens A, Ramirez-Lopez L (2020). An introduction to the prospectr package. R package version 0.2.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {An introduction to the prospectr package},
    author = {Antoine Stevens and Leornardo Ramirez-Lopez},
    publication = {R package Vignette},
    year = {2020},
    note = {R package version 0.2.1},
  }