To cite package 'fungible' in publications use:

Waller NG (2021). fungible: Psychometric Functions from the Waller Lab.. version 1.99.

Corresponding BibTeX entry:

  @Manual{,
    title = {fungible: Psychometric Functions from the Waller Lab.},
    author = {Niels G. Waller},
    year = {2021},
    note = {version 1.99},
  }