Lüdecke D (2019). sjlabelled: Labelled Data Utility Functions (Version 1.1.1). doi: 10.5281/zenodo.1249215, https://CRAN.R-project.org/package=sjlabelled.

Corresponding BibTeX entry:

  @Manual{,
    title = {sjlabelled: Labelled Data Utility Functions (Version
      1.1.1)},
    author = {Daniel Lüdecke},
    year = {2019},
    url = {https://CRAN.R-project.org/package=sjlabelled},
    doi = {10.5281/zenodo.1249215},
  }