| Author's List |
| title | creator | language | description | tableOfContents | contributor | subject | created |
| Citadel of Faith | Shoghi Effendi, 1897-1957 | en | 2006-09-16 | ||||
| Citadel | Budrys, Algis, 1931-2008 | en | Dongen, H. R. van [Illustrator] | Space colonies -- Fiction; Science fiction | 2008-08-04 |