2021 International Tiny House Provisions: Code, Commentary and Standards for Design, Construction and Compliance - Chapter 8: Roof-Ceiling Construction - R804.3 Roof construction.
Rafter Span Tables for Surveyors - Roof Construction | Right Survey
Designs for Glued Trusses
Trusses
Roof Truss Buying Guide at Menards®
Ask the Builder: Home can be built without load-bearing walls