To cite package ‘COCOA’ in publications use:

  Lawson, J.T., Smith, J.P., Bekiranov, S. et al. COCOA: coordinate
  covariation analysis of epigenetic heterogeneity. Genome Biol 21, 240
  (2020). https://doi.org/10.1186/s13059-020-02139-4

A BibTeX entry for LaTeX users is

  @Article{,
    title = {COCOA: coordinate covariation analysis of epigenetic heterogeneity},
    author = {John T. Lawson and Jason P. Smith and Stefan Bekiranov and Francine E. Garrett-Bakelman and Nathan C. Sheffield},
    year = {2020},
    journal = {Genome Biology},
    volume = {21},
    doi = {10.1186/s13059-020-02139-4},
    url = {https://genomebiology.biomedcentral.com/articles/10.1186/s13059-020-02139-4},
  }