@book{wilkinson-pickett-2009,
  title = {{The Spirit Level: Why More Equal Societies Almost Always Do Better}},
  author = {Richard Wilkinson and Kate Pickett},
  year = {2009},
  publisher = {Allen Lane (UK) / Bloomsbury Press},
  url = {https://en.wikipedia.org/wiki/The_Spirit_Level_(Wilkinson_and_Pickett_book)}
}