To cite clusterSEs in publications use:

Justin Esarey and Andrew Menger (2017). Practical and Effective Approaches to Dealing with Clustered Data. Political Science Research and Methods, forthcoming, 1-35. URL: http://jee3.web.rice.edu/cluster-paper.pdf.

Corresponding BibTeX entry:

  @Article{,
    title = {Practical and Effective Approaches to Dealing with
      Clustered Data},
    author = {Justin Esarey and Andrew Menger},
    journal = {Political Science Research and Methods},
    year = {2017},
    volume = {forthcoming},
    pages = {1--35},
    url = {http://jee3.web.rice.edu/cluster-paper.pdf},
  }