Books:
Brugmansia and Datura
Angels'Trumpets and Thorn Apples
by Ulkick and H.G.Priessel
available at Amazon.com
Engelstrompeten
by Monika Gottschalk
this one is written in German but comes with an English translation booklet
available at www.karcheskycanna.com/
There is also an e-book by Tonny Surrow Hansen
I have not seen this one but will try to find the title and post it
