To cite fishtree in publications use:

Chang, J., Rabosky, D. L., Smith, S. A., & Alfaro, M. E. (2019). An R package and online resource for macroevolutionary studies using the ray‐finned fish tree of life. Methods in Ecology and Evolution.<doi:10.1111/2041-210x.13182>

Corresponding BibTeX entry:

  @Article{,
    title = {An R package and online resource for macroevolutionary
      studies using the ray‐finned fish tree of life},
    author = {Jonathan Chang and Daniel L Rabosky and Stephen A Smith
      and Michael E Alfaro},
    journal = {Methods in Ecology and Evolution},
    year = {2019},
    url = {https://doi.org/10.1111/2041-210X.13182},
  }