ETAI is the gold standard for French vehicle manuals. Their "RTA" series is highly detailed and available in both digital (PDF/Web) and print formats. Comprehensive coverage and factory-spec diagrams.
For those seeking the absolute "best" technical data, the official manufacturer service portal provides the exact documentation used by Citroën dealerships.
Includes high-quality photos for every step of the process. 3. Official Citroën Service Box