To cite lslx in publications use:

Huang P (2020). “lslx: Semi-Confirmatory Structural Equation Modeling via Penalized Likelihood.” Journal of Statistical Software, 93(7), 1–37. doi: 10.18637/jss.v093.i07.

Corresponding BibTeX entry:

  @Article{,
    title = {{lslx}: Semi-Confirmatory Structural Equation Modeling via
      Penalized Likelihood},
    author = {Po-Hsien Huang},
    journal = {Journal of Statistical Software},
    year = {2020},
    volume = {93},
    number = {7},
    pages = {1--37},
    doi = {10.18637/jss.v093.i07},
  }