To cite plot3logit in publications use:

Santi F, Dickson MM, Espa G, Giuliani D (2022). “plot3logit: Ternary Plots for Interpreting Trinomial Regression Models.” Journal of Statistical Software, Code Snippets, 103(1), 1–27. doi:10.18637/jss.v103.c01.

Corresponding BibTeX entry:

  @Article{,
    title = {{plot3logit}: Ternary Plots for Interpreting Trinomial
      Regression Models},
    author = {Flavio Santi and Maria Michela Dickson and Giuseppe Espa
      and Diego Giuliani},
    journal = {Journal of Statistical Software, Code Snippets},
    year = {2022},
    volume = {103},
    number = {1},
    pages = {1--27},
    doi = {10.18637/jss.v103.c01},
  }