To cite dynsurv in publications use:

Wang X, Chen M, Wang W, Yan J (2019). dynsurv: Dynamic Models for Survival Data. R package version 0.3-7, https://CRAN.R-project.org/package=dynsurv.

Corresponding BibTeX entry:

  @Manual{,
    title = {{dynsurv}: {D}ynamic Models for Survival Data},
    author = {Xiaojing Wang and Ming-Hui Chen and Wenjie Wang and Jun
      Yan},
    note = {{R} package version 0.3-7},
    year = {2019},
    url = {https://CRAN.R-project.org/package=dynsurv},
  }