To cite shinyssdtools in publications use:

  Dalgarno, S. (2021). shinyssdtools: A web application for fitting
  Species Sensitivity Distributions (SSDs). Journal of Open Source
  Software, 6(57), 2848. https://doi.org/10.21105/joss.02848.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{shinyssdtools}: A web application for fitting Species Sensitivity Distributions (SSDs)},
    author = {Seb Dalgarno},
    journal = {Journal of Statistical Software},
    year = {2021},
    volume = {6},
    number = {57},
    pages = {2848},
    url = {https://doi.org/10.21105/joss.02848},
  }