To cite ThreeWay in publications use:

Giordani P, Kiers HAL, Del Ferraro MA (2014). “Three-Way Component Analysis Using the R Package ThreeWay.” Journal of Statistical Software, 57(7), 1–23. http://www.jstatsoft.org/v57/i07/.

Corresponding BibTeX entry:

  @Article{,
    title = {Three-Way Component Analysis Using the {R} Package
      {ThreeWay}},
    author = {Paolo Giordani and Henk A. L. Kiers and Maria Antonietta
      {Del Ferraro}},
    journal = {Journal of Statistical Software},
    year = {2014},
    volume = {57},
    number = {7},
    pages = {1--23},
    url = {http://www.jstatsoft.org/v57/i07/},
  }