To cite mase in publications use:

McConville K, Yamamoto J, Tang B, Zhu G, Cheung S, Li S (2018). mase: Model-Assisted Survey Estimation. https://cran.r-project.org/package=mase.

Corresponding BibTeX entry:

  @Manual{,
    title = {mase: Model-Assisted Survey Estimation},
    author = {Kelly McConville and Josh Yamamoto and Becky Tang and
      George Zhu and Shirley Cheung and Sida Li},
    year = {2018},
    url = {https://cran.r-project.org/package=mase},
  }