To cite corr2D in publications use:

Geitner R, Fritzsch R, Popp J, Bocklitz TW (2019). “corr2D: Implementation of Two-Dimensional Correlation Analysis in R.” Journal of Statistical Software, 90(3), 1–33. doi:10.18637/jss.v090.i03.

Corresponding BibTeX entry:

  @Article{,
    title = {{corr2D}: Implementation of Two-Dimensional Correlation
      Analysis in {R}},
    author = {Robert Geitner and Robby Fritzsch and J\"urgen Popp and
      Thomas W. Bocklitz},
    journal = {Journal of Statistical Software},
    year = {2019},
    volume = {90},
    number = {3},
    pages = {1--33},
    doi = {10.18637/jss.v090.i03},
  }