- https://library.oreilly.com/book/0636920030195/mining-the-social-web-2nd-edition/9 – this is where I came across “to vet”
- http://shop.oreilly.com/product/0636920030195.do – “Mining the Social Web, 2nd Edition” – Preface / “Conventions Used in This Book” / the very 1st paragraph
- https://en.wiktionary.org/wiki/vet#Etymology_3
- http://www.slate.com/articles/news_and_politics/explainer/2008/09/vetting_vet.html – the origins of vet, verb tr.