To cite package 'umx' in publications use:

Timothy C. Bates, Michael C. Neale, Hermine H. Maes, (2019). umx: A library for Structural Equation and Twin Modelling in R. Twin Research and Human Genetics, 22, 27-41.<doi:10.1017/thg.2019.2>

For the latest developments in umx (version 4.5), please also cite:

Luis F.S. Castro-de-Araujo, Nathan A. Gillespie, Michael C. Neale, and Timothy Charles Bates (2026). umx version 4.5: Extending Twin and Path-Based SEM in R with CLPM, MR-DoC, Definition Variables, Onyx Integration, and Censored Distributions. Twin Research and Human Genetics, 1-6.<doi:10.1017/thg.2026.10056>

Corresponding BibTeX entries:

  @Article{,
    title = {umx: A library for Structural Equation and Twin Modelling
      in R},
    author = {Timothy C. Bates and Michael C. Neale and Hermine H.
      Maes},
    journal = {Twin Research and Human Genetics},
    publisher = {Cambridge Press},
    year = {2019},
    volume = {22},
    pages = {27-41},
    doi = {10.1017/thg.2019.2},
  }

  @Article{,
    title = {umx version 4.5: Extending Twin and Path-Based SEM in R
      with CLPM, MR-DoC, Definition Variables, Onyx Integration, and
      Censored Distributions},
    author = {Luis F.S. Castro-de-Araujo and Nathan A. Gillespie and
      Michael C. Neale and Timothy Charles Bates},
    journal = {Twin Research and Human Genetics},
    year = {2026},
    pages = {1-6},
    doi = {10.1017/thg.2026.10056},
  }