To cite drake in publications use:

Landau WM (2018). “The drake R package: a pipeline toolkit for reproducibility and high-performance computing.” Journal of Open Source Software, 3(21). https://doi.org/10.21105/joss.00550.

Corresponding BibTeX entry:

  @Article{,
    title = {The drake R package: a pipeline toolkit for
      reproducibility and high-performance computing},
    author = {William Michael Landau},
    journal = {Journal of Open Source Software},
    year = {2018},
    volume = {3},
    number = {21},
    url = {https://doi.org/10.21105/joss.00550},
  }