Sources from the episode:

* Wikipedia: Absinthe (https://en.wikipedia.org/wiki/Absinthe)

* Wikipedia: Thujone (https://en.wikipedia.org/wiki/Thujone)

* Wikipedia: Ouzo effect (https://en.wikipedia.org/wiki/Ouzo_effect)

* Jad Adams: Hideous Absinthe: A History of the Devil in a Bottle (https://books.google.com/books/about/Hideous_Absinthe.html?id=b7FwE6EpNPoC)