To cite the imputeTS package, use:

Moritz S (2016). imputeTS: Time Series Missing Value Imputation. R package version 1.7, https://CRAN.R-project.org/package=imputeTS.

Corresponding BibTeX entry:

  @Manual{,
    title = {imputeTS: Time Series Missing Value Imputation},
    author = {Steffen Moritz},
    year = {2016},
    note = {R package version 1.7},
    url = {https://CRAN.R-project.org/package=imputeTS},
  }