% use:
% \usepackage{url}
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@Misc{StoughtonFormalLanguageTheory,
  author =    {Alley Stoughton},
  title =     {{Formal Language Theory: Integrating Experimentation and Proof}},
  howpublished = {\url{https://alleystoughton.us/forlan/book.pdf}},
  year =      {2003--2022},
  note =      {Open source book.}
}

@Misc{StoughtonForlan,
  author =    {Alley Stoughton},
  title =     {{The Forlan Project}},
  howpublished = {\url{https://alleystoughton.us/forlan}},
  year =      {2003--2022},
  note =      {Open source software.}
}