To cite rPDBapi in publications use:

  Korkmaz S, Yamasan BE. rPDBapi: A Comprehensive R Package Interface
  for Accessing the Protein Data Bank. The R Journal. 2025;
  17(2):109-145.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {rPDBapi: A Comprehensive R Package Interface for Accessing the Protein Data Bank.},
    author = {Selcuk Korkmaz and Bilge Eren Yamasan},
    journal = {The R Journal},
    year = {2025},
    volume = {17},
    number = {2},
    pages = {109--145},
    url = {https://journal.r-project.org/articles/RJ-2025-016/RJ-2025-016.pdf},
  }