Cover credits
The cover was designed by VIVA using a cover template designed by Knowledge Works Global, Ltd. It includes:
- Colosseum in Rome-April 2007-1- copie 2B by Diliff is licensed under a Creative Commons Attribution-Share Alike 2.5 Generic license.
- Human-headed winged lion (lamassu) is a public domain via The Metropolitan Museum of Art, New York , Gift of John D. Rockefeller Jr., 1932. Accession Number: 32.143.2.
- 2017-05 Stonehenge 06 by Antoine Lamielle is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.