To cite ClickClust in publications use:

  Volodymyr Melnykov (2016). ClickClust: An R Package for Model-Based
  Clustering of Categorical Sequences. Journal of Statistical Software,
  74(9), 1-34. doi:10.18637/jss.v074.i09

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{ClickClust}: An {R} Package for Model-Based Clustering of Categorical Sequences},
    author = {Volodymyr Melnykov},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {74},
    number = {9},
    pages = {1--34},
    doi = {10.18637/jss.v074.i09},
  }