Cannabis and Cannabinoids
by Franjo Grotenhermen and Ethan Russo
I consider this to be the most comprehensive collection of studies and sources on the subject, a sort of bible for the debate that has been going for the last 20 years. That said, this book was written in 2002 and as this field is developing so fast – every month there are new results and discoveries – it is impossible to have a fully up-to-date book.