I will join the authors above, excellent books from scientists who have had their hand in psychedelics and euphoretics. And I would like to recommend a fictional, but very powerful book "Me, My Friends and Heroin". Posted by Christina Fenerelbau
I can also add to this: the DMT spirit molecule, the seven languages of God, food of the gods, areas of the human unconscious and psychedelic experience.
Alexander Shulgin - PIHKaL
Albert Hoffman - LSD is my problem child
Start with these, they give a pretty good idea of mind-altering substances.