To cite UCSCXenaTools in publications use:

Wang S, Liu X (2019). “The UCSCXenaTools R package: a toolkit for accessing genomics data from UCSC Xena platform, from cancer multi-omics to single-cell RNA-seq.” Journal of Open Source Software. https://doi.org/10.21105/joss.01627.

Corresponding BibTeX entry:

  @Article{,
    title = {The UCSCXenaTools R package: a toolkit for accessing
      genomics data from UCSC Xena platform, from cancer multi-omics to
      single-cell RNA-seq},
    author = {Shixiang Wang and Xuesong Liu},
    journal = {Journal of Open Source Software},
    year = {2019},
    url = {https://doi.org/10.21105/joss.01627},
  }