To cite the 'cpca' package in publications use:

A. Ziyatdinov, S. Kanaan-Izquierdo, N. T. Trendafilov and A. Perera-Lluna (2014) cpca: Methods to perform Common Principal Component Analysis (CPCA). R package version 0.1.2. https://github.com/variani/cpca

Corresponding BibTeX entry:

  @Manual{,
    title = {cpca: Methods to perform Common Principal Component
      Analysis (CPCA)},
    author = {Andrey Ziyatdinov and Samir Kanaan-Izquierdo and Nickolay
      T. Trendafilov and Alexandre Perera-Lluna},
    year = {2014},
    url = {https://github.com/variani/cpca},
    note = {R package version 0.1.2},
  }