To cite CircMLE in publications use:

Fitak, R. R. and Johnsen, S. (2017). Bringing the analysis of animal orientation data full circle: model-based approaches with maximum likelihood. Journal of Experimental Biology, 220, 3878-3882.<doi:10.1242/jeb.167056>

Corresponding BibTeX entry:

  @Article{,
    title = {Bringing the analysis of animal orientation data full
      circle: model-based approaches with maximum likelihood},
    author = {Robert R. Fitak and Sonke Johnsen},
    journal = {Journal of Experimental Biology},
    year = {2017},
    volume = {220},
    number = {3},
    pages = {3878-3882},
    url = {https://doi.org/10.1242/jeb.167056},
  }