Use the following references when citing the ‘coin’ package in
publications:

  Hothorn T, Hornik K, van de Wiel MA, Zeileis A (2006). “A Lego system
  for conditional inference.” _The American Statistician_, *60*(3),
  257-263. doi:10.1198/000313006X118430
  <https://doi.org/10.1198/000313006X118430>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A {L}ego system for conditional inference},
    author = {Torsten Hothorn and Kurt Hornik and Mark A. {van de Wiel} and Achim Zeileis},
    journal = {The American Statistician},
    year = {2006},
    volume = {60},
    number = {3},
    pages = {257--263},
    doi = {10.1198/000313006X118430},
  }

for the implemented theoretical framework and/or

Hothorn T, Hornik K, van de Wiel MA, Zeileis A (2008). “Implementing a
class of permutation tests: The coin package.” _Journal of Statistical
Software_, *28*(8), 1-23. doi:10.18637/jss.v028.i08
<https://doi.org/10.18637/jss.v028.i08>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Implementing a class of permutation tests: The {coin} package},
    author = {Torsten Hothorn and Kurt Hornik and Mark A. {van de Wiel} and Achim Zeileis},
    journal = {Journal of Statistical Software},
    year = {2008},
    volume = {28},
    number = {8},
    pages = {1--23},
    doi = {10.18637/jss.v028.i08},
  }

for the implementation approach.