To cite ijtiff in publications use:

  Nolan R, Padilla-Parra S (2018). “ijtiff: An R package providing TIFF
  I/O for ImageJ users.” _Journal of Open Source Software_, *3*(23),
  633. doi:10.21105/joss.00633 <https://doi.org/10.21105/joss.00633>.

A BibTeX entry for LaTeX users is

  @Article{ijtiff,
    doi = {10.21105/joss.00633},
    year = {2018},
    month = {mar},
    publisher = {The Open Journal},
    volume = {3},
    number = {23},
    pages = {633},
    author = {Rory Nolan and Sergi Padilla-Parra},
    title = {ijtiff: An R package providing {TIFF} I/O for {ImageJ} users},
    journal = {Journal of Open Source Software},
  }