To cite callsync in publications use:

  Smeele, S. Q., Tyndel, S. A., Klump,B. C., Alarcón-Nieto, G., &
  Aplin, L. M. (2024). callsync: An R package for alignment and
  analysis of multi-microphone animal recordings. Ecology and
  Evolution, 14, e11384. https://doi.org/10.1002/ece3.11384
  
  NOTE: please also cite the 'tuneR' and 'seewave' packages if you use
  any function that depend on these.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {callsync: an R package for alignment and analysis of multi-microphone animal recordings},
    author = {Simeon Q Smeele and Stephen A Tyndel and Barbara C Klump and Gustavo Alarcon-Nieto and Lucy M Aplin},
    journal = {Ecology and Evolution},
    year = {2024},
    url = {https://doi.org/10.1002/ece3.11384},
  }
