To cite package ‘interfacer’ in publications use: Challen R (2025). _interfacer: Define and Enforce Contracts for Dataframes as Function Parameters_. R package version 0.3.3, . A BibTeX entry for LaTeX users is @Manual{, title = {interfacer: Define and Enforce Contracts for Dataframes as Function Parameters}, author = {Robert Challen}, year = {2025}, note = {R package version 0.3.3}, url = {https://CRAN.R-project.org/package=interfacer}, }