To cite socviz in publications use:

Healy K (2019). Data Visualization: A Practical Introduction. Princeton University Press, Princeton. http://www.socviz.co.

Corresponding BibTeX entry:

  @Book{,
    title = {Data Visualization: A Practical Introduction},
    author = {Kieran Healy},
    publisher = {Princeton University Press},
    address = {Princeton},
    year = {2019},
    url = {http://www.socviz.co},
  }