To cite timereg in publications use:

Thomas H. Scheike, Torben Martinussen (2006). Dynamic Regression models for survival data. Springer, New-York
Thomas H. Scheike, Mei-Jie Zhang (2011). Analyzing Competing Risk Data Using the R timereg Package. Journal of Statistical Software, 38(2), 1-15. URL http://www.jstatsoft.org/v38/i02/.

Corresponding BibTeX entries:

  @Book{,
    title = {Dynamic Regression models for survival data},
    author = {Thomas H. Scheike and Torben Martinussen},
    publisher = {Springer, NY},
    year = {2006},
  }
  @Article{,
    title = {Analyzing Competing Risk Data Using the {R} {timereg}
      Package},
    author = {Thomas H. Scheike and Mei-Jie Zhang},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {38},
    number = {2},
    pages = {1--15},
    url = {http://www.jstatsoft.org/v38/i02/},
  }