To cite tidyLPA in publications use:

Rosenberg, J. M., Beymer, P. N., Anderson, D. J., & Schmidt, J. A. (2018). tidyLPA: An R Package to Easily Carry Out Latent Profile Analysis (LPA) Using Open-Source or Commercial Software. Journal of Open Source Software, 3(30), 978, https://doi.org/10.21105/joss.00978

Corresponding BibTeX entry:

  @Article{,
    title = {tidyLPA: An R Package to Easily Carry Out Latent Profile
      Analysis (LPA) Using Open-Source or Commercial Software},
    author = {Joshua M. Rosenberg and Patrick N. Beymer and Daniel J.
      Anderson and Jennifer A. Schmidt},
    journal = {Journal of Open Source Software},
    year = {2018},
    volume = {3},
    number = {30},
    pages = {978},
    url = {http://joss.theoj.org/papers/10.21105/joss.00978},
    doi = {10.21105/joss.00978},
  }