To cite investr in publications use:

Greenwell BM, Kabban CMS (2014). “investr: An R Package for Inverse Estimation.” The R Journal, 6(1), 90–100. https://doi.org/10.32614/RJ-2014-009.

Corresponding BibTeX entry:

  @Article{,
    title = {investr: An R Package for Inverse Estimation},
    author = {Brandon M. Greenwell and Christine M. Schubert Kabban},
    journal = {The R Journal},
    year = {2014},
    volume = {6},
    number = {1},
    pages = {90--100},
    url = {https://doi.org/10.32614/RJ-2014-009},
  }