Sketching the basics by Koos Eissen Roselien Steur (z-lib.org)
KODAK Capture software
Tetralogue: I'm Right, You're Wrong
Timothy Williamson
Ringworld
Larry Niven
Ringworld (1)
Drawing on the Right Side of the Brain: The Definitive, 4th ...
Betty Edwards
Vacuum Diagrams
Stephen Baxter
Xeelee (5)
Timelike Infinity
Xeelee (2)
Ring
Xeelee (4)