Included photos are public domain, by the following authors:

- Anthony Cantin
- Dlanor S
- Fabio Santaniello Bruun
- Leon Overweel
- Lucas Benjamin
- Maciek Krawiec
- Mr Karl
- Pathum Danthanarayana
- Pierre Châtel-Innocenti
- Rawpixel
- Ryan Stone
- Trevor Cole
- Wexor Tmg
