E is described by two draft books:
- Robust Composition: Towards a Unified Approach to Access Control and Concurrency Control
- MarkM's dissertation. Explains the rationale, philosophy, and goals of E and related systems.
- E in a Walnut
- Marc Stiegler's draft tutorial book on the E programming language.
E's grammar is similiar to other C languages but its semantics have more in common with various lisps.