To cite spifa in publications, please cite both the methodology paper
and the package:

  Chacón-Montalván, E. A., Parry, L., Giorgi, E., Torres, P., Orellana,
  J. D. Y., Moraga, P., and Taylor, B. M. (2025). Mapping food
  insecurity in the Brazilian Amazon using a spatial item factor
  analysis model. The Annals of Applied Statistics, 19(4), 3438-3463.
  https://doi.org/10.1214/25-AOAS2072

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Mapping food insecurity in the {B}razilian {A}mazon using a spatial item factor analysis model},
    author = {Erick A. Chacón-Montalván and Luke Parry and Emanuele Giorgi and Patricia Torres and Jesem Douglas Yamall Orellana and Paula Moraga and Benjamin M. Taylor},
    journal = {The Annals of Applied Statistics},
    year = {2025},
    volume = {19},
    number = {4},
    pages = {3438--3463},
    doi = {10.1214/25-AOAS2072},
  }

  Chacón-Montalván, E. A. (2026). spifa: Bayesian Spatial Item Factor
  Analysis. R package version 0.1.0.
  https://github.com/ErickChacon/spifa

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{spifa}: Bayesian Spatial Item Factor Analysis},
    author = {Erick A. Chacón-Montalván},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/ErickChacon/spifa},
  }