To cite the R package cylcop in publications use:

  Florian H. Hodel, John R. Fieberg (2021). Cylcop: An R Package for
  Circular-Linear Copulae with Angular Symmetry. bioRxiv,
  doi:10.1101/2021.07.14.452253. URL
  https://www.biorxiv.org/content/10.1101/2021.07.14.452253v3/.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Cylcop: An R Package for Circular-Linear Copulae with Angular Symmetry},
    author = {{Florian H. Hodel} and {John R. Fieberg}},
    journal = {bioRxiv},
    year = {2021},
    doi = {10.1101/2021.07.14.452253},
    url = {https://www.biorxiv.org/content/10.1101/2021.07.14.452253v3/},
  }

  Florian H. Hodel, John R. Fieberg (2022). Circular-Linear Copulae for
  Animal Movement Data. Methods in Ecology and Evolution,
  doi:10.1111/2041-210X.13821.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Circular-Linear Copulae for Animal Movement Data},
    author = {{Florian H. Hodel} and {John R. Fieberg}},
    journal = {Methods in Ecology and Evolution},
    year = {2022},
    doi = {10.1111/2041-210X.13821},
  }