To cite package ‘merlin’ in publications use:

  Martin E, Gasparini A, Crowther M (2020). _merlin: Mixed Effects
  Regression for Linear, Non-Linear and User-Defined Models_. R package
  version 0.1.0,
  <https://github.com/cranhaven/cranhaven.r-universe.dev>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {merlin: Mixed Effects Regression for Linear, Non-Linear and User-Defined
Models},
    author = {Emma Martin and Alessandro Gasparini and Michael Crowther},
    year = {2020},
    note = {R package version 0.1.0},
    url = {https://github.com/cranhaven/cranhaven.r-universe.dev},
  }