- selfGDL is the detailed command reference of all known GDL commands from GDL enthusiasts Frank Beister and Jochen Suehlo.
GDL Paper and Web documentation sources
GDL Cookbook 3 + 4
- the GDL bible by David Nicholson Cole
- Download-Link: nottingham.ac.uk
- available in German too: graphisoft.de
- GDL Online Course in German from A-Null