To cite the dynprog package in publications use:

  Mailund, T. (2018) Domain-Specific Languages in R: Advanced
  Statistical Programming, Apress. ISBN 1484235878

A BibTeX entry for LaTeX users is

  @Book{,
    author = {Thomas Mailund},
    title = {Domain-Specific Languages in R: Advanced Statistical Programming},
    publisher = {Apress},
    year = {2018},
    url = {https://amzn.to/2DRmFXb},
    isbn = {1484235878},
  }