To cite package depmix in publications, use the following:

Visser I (2007). “depmix: An R-package for fitting mixture models on mixed multivariate data with Markov dependencies.” R-package manual. https://CRAN.R-project.org.

Corresponding BibTeX entry:

  @Article{,
    title = {{depmix}: An R-package for fitting mixture models on mixed
      multivariate data with Markov dependencies},
    author = {Ingmar Visser},
    journal = {R-package manual},
    year = {2007},
    url = {https://CRAN.R-project.org},
  }