To cite 'correlation' in publications use:

Makowski D, Ben-Shachar M, Patil I, Lüdecke D (2020). “Methods and Algorithms for Correlation Analysis in R.” Journal of Open Source Software, 5(51), 2306. doi:10.21105/joss.02306, https://joss.theoj.org/papers/10.21105/joss.02306.

Corresponding BibTeX entry:

  @Article{,
    title = {Methods and Algorithms for Correlation Analysis in R.},
    author = {Dominique Makowski and Mattan S. Ben-Shachar and
      Indrajeet Patil and Daniel Lüdecke},
    doi = {10.21105/joss.02306},
    year = {2020},
    journal = {Journal of Open Source Software},
    number = {51},
    volume = {5},
    pages = {2306},
    url = {https://joss.theoj.org/papers/10.21105/joss.02306},
  }