To cite ctsem in publications use:

Charles C. Driver, Johan H. L. Oud, Manuel C. Voelkle (2017). Continuous Time Structural Equation Modeling with R Package ctsem. Journal of Statistical Software, 77(5), 1-35.<doi:10.18637/jss.v077.i05>

Corresponding BibTeX entry:

  @Article{,
    title = {Continuous Time Structural Equation Modeling with {R}
      Package {ctsem}},
    author = {Charles C. Driver and Johan H. L. Oud and Manuel C.
      Voelkle},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {77},
    number = {5},
    pages = {1--35},
    doi = {10.18637/jss.v077.i05},
  }