To cite corrplot in publications use:

Taiyun Wei and Viliam Simko (2017). R package "corrplot": Visualization of a Correlation Matrix (Version 0.84). Available from https://github.com/taiyun/corrplot

Corresponding BibTeX entry:

  @Manual{corrplot2017,
    title = {R package "corrplot": Visualization of a Correlation
      Matrix},
    author = {Taiyun Wei and Viliam Simko},
    year = {2017},
    note = {(Version 0.84)},
    url = {https://github.com/taiyun/corrplot},
  }