| Author | Titles | | 1.
| Umaña Caro, Camilo | 2 | | 2.
| Umar Khaiyam, ca 1044-1123 | 0 | | 3.
| Author is: Omar Khayyam, ca 1044-1123 | 15 | | 4.
| Umar Sharaf | 1 | | 5.
| Umbach, Maiken | 1 | | 6.
| Umbelino, Ana | 1 | | 7.
| Umbelino, Cláudia | 1 | | 8.
| Umbelino, Luís António | 4 | | 9.
| Umbelino, Luís António Ferreira Correia | 0 | | 10.
| Author is: Umbelino, Luís António | 4 | | 11.
| Umberg, Johann Baptist | 1 | | 12.
| Umbo, pseud. | 1 |
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