To cite the 'DCchoice' package in publications use:

Tomoaki Nakatani, Hideo Aizaki, Kazuo Sato (2016). DCchoice: An R Package for Analyzing Dichotomous Choice Contingent Valuation Data. R package version 0.0.15.

Corresponding BibTeX entry:

  @Manual{,
    title = {DCchoice: An R Package for Analyzing Dichotomous Choice
      Contingent Valuation Data},
    author = {Tomoaki Nakatani and Hideo Aizaki and Kazuo Sato},
    year = {2016},
    note = {R package version 0.0.15},
  }