1. Food of the gods—the search for the original tree of knowledge;McKenna,1992
2. Persephone’s quest—entheogens and the origin of religion;Wasson,1986
3. TIHKAL—The continuation;Shulgin,1997
4. The doors of perception and heaven and hell;Huxley,1990
5. In the buddha’s words—an anthology of discourses from the pāli canon;Boddhi,2005