| Source | Format | "UPD" Availability | Cost | |--------|--------|--------------------|------| | (French) | PDF / EPUB | Highest (direct from publisher) | €20-35 | | Google Play Books | EPUB (convertible to PDF) | Medium (check edition date) | $25-40 | | Amazon Kindle | KFX (can print to PDF) | Good (auto-updates) | $24.99 | | La Martinière (Publisher) | PDF with DRM | Best – official updates | Varies | | Ebookeland | PDF | Low – often older scans | $15 |