To cite randomLCA in publications use:

Beath KJ (2017). “randomLCA: An R Package for Latent Class with Random Effects Analysis.” Journal of Statistical Software, 81(13), pp. 1–25. doi: 10.18637/jss.v081.i13.

Corresponding BibTeX entry:

  @Article{,
    title = {{randomLCA}: An {R} Package for Latent Class with Random
      Effects Analysis},
    author = {Ken J. Beath},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {81},
    number = {13},
    pages = {1--25},
    doi = {10.18637/jss.v081.i13},
  }