To cite {ciftiTools} in publications use:

Pham DD, Muschelli J, Mejia AF (2021). “ciftiTools: A package for reading, writing, visualizing and manipulating CIFTI files in R.” https://doi.org/10.1016/j.neuroimage.2022.118877.

Corresponding BibTeX entry:

  @Misc{pham2021ciftitools,
    title = {ciftiTools: A package for reading, writing, visualizing
      and manipulating CIFTI files in R},
    author = {Damon D Pham and John Muschelli and Amanda F Mejia},
    year = {2021},
    url = {https://doi.org/10.1016/j.neuroimage.2022.118877},
  }