To cite tidyHeatmap in publications use:

  Mangiola et al. tidyHeatmap: an R package for modular heatmap
  production based on tidy principles. JOSS 2020

A BibTeX entry for LaTeX users is

  @Article{,
    title = {tidyHeatmap: an R package for modular heatmap production based on tidy principles},
    author = {Mangiola S. and Papenfuss A.},
    journal = {Journal of Open Source Software},
    year = {2020},
    volume = {5},
    number = {52},
    pages = {2472},
    url = {https://doi.org/10.21105/joss.02472},
    doi = {10.21105/joss.02472},
  }