To cite the 'tclust' package in publications use:

  Fritz H, Garcia-Escudero LA, Mayo-Iscar A (2012). “tclust: An R
  Package for a Trimming Approach to Cluster Analysis.” _Journal of
  Statistical Software_, *47*(12), 1-26. doi:10.18637/jss.v047.i12
  <https://doi.org/10.18637/jss.v047.i12>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{tclust}: An {R} Package for a Trimming Approach to Cluster Analysis},
    journal = {Journal of Statistical Software},
    author = {Heinrich Fritz and Luis A. Garcia-Escudero and Agustin Mayo-Iscar},
    year = {2012},
    volume = {47},
    number = {12},
    pages = {1--26},
    doi = {10.18637/jss.v047.i12},
  }