To cite package ‘huttenlocher1991’ in publications use:

  Huttenlocher J, Haight W, Bryk A, Seltzer M, Lyons T (2024).
  _huttenlocher1991: Vocabulary growth in 22 infants (Huttenlocher et
  al., 1991)_. R package version 0.1.0,
  <https://github.com/tjmahr/huttenlocher1991>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {huttenlocher1991: Vocabulary growth in 22 infants (Huttenlocher et al., 1991)},
    author = {Janellen Huttenlocher and Wendy Haight and Anthony Bryk and Michael Seltzer and Thomas Lyons},
    year = {2024},
    note = {R package version 0.1.0},
    url = {https://github.com/tjmahr/huttenlocher1991},
  }