To cite amt in publications use:

Signer J., Fieberg J., Avgar T. (2011). Animal movement tools (amt): R package for managing tracking data and conducting habitat selection analyses. Ecology and Evolution, 2019 9, 880-890. URL https://doi.org/10.1002/ece3.4823.

Corresponding BibTeX entry:

  @Article{,
    title = {Animal movement tools (amt): R package for managing
      tracking data and conducting habitat selection analyses},
    author = {Johannes Signer and John Fieberg and Tal Avgar},
    journal = {Ecology and Evolution},
    year = {2019},
    volume = {9},
    pages = {880--890},
    url = {https://doi.org/10.1002/ece3.4823},
  }