To cite package ‘CytoML’ in publications use:

  Finak, G. Jiang, M., Gottardo, R. (2018) CytoML for cross-platform
  cytometry data sharing. Cytometry A. 93:1189-1196

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Greg Finak and Wenxin Jiang and Raphael Gottardo},
    title = {CytoML for cross-platform cytometry data sharing},
    journal = {Cytometry Part A},
    year = {2018},
    volume = {93},
    pages = {-7},
    url = {https://doi.org/10.1002/cyto.a.23663},
  }

As CytoML is evolving, you may want to cite the package version. see
packageVersion('CytoML')