To cite mice in publications use:

van Buuren S, Groothuis-Oudshoorn K (2011). “mice: Multivariate Imputation by Chained Equations in R.” Journal of Statistical Software, 45(3), 1-67. https://www.jstatsoft.org/v45/i03/.

Corresponding BibTeX entry:

  @Article{,
    title = {{mice}: Multivariate Imputation by Chained Equations in
      R},
    author = {Stef {van Buuren} and Karin Groothuis-Oudshoorn},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {45},
    number = {3},
    pages = {1-67},
    url = {https://www.jstatsoft.org/v45/i03/},
  }