To cite sylly in publications use:

Michalke, M. (2018). sylly: Hyphenation and Syllable Counting for Text Analysis (Version 0.1-5). Available from https://reaktanz.de/?c=hacking&s=sylly

Corresponding BibTeX entry:

  @Manual{,
    title = {sylly: Hyphenation and Syllable Counting for Text
      Analysis},
    author = {Meik Michalke},
    year = {2018},
    note = {(Version 0.1-5)},
    url = {https://reaktanz.de/?c=hacking&s=sylly},
  }