| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1991 | 978-0-9630096-0-9 | Alexander Shulgin · Ann Shulgin | Pihkal: A Chemical Love Story |
| 2002 | 978-0-9630096-2-3 | Alexander T. Shulgin · Wendy E. Perry | The Simple Plant Isoquinolines |
| 1991 | 978-0-9630096-7-8 | Ann Shulgin | Pihkal: A Chemical Love Story |
| 1997 | 978-0-9630096-9-2 | Alexander Shulgin · Ann Shulgin | Tihkal: The Continuation |