| Author | Titles | | 1.
| Guardião, Ana | 1 | | 2.
| Guardigli, Decio | 44 | | 3.
| Guardini, Romano, 1885-1968 | 3 | | 4.
| Guardiola, António | 1 | | 5.
| Guardiola, Juan | 3 | | 6.
| Guardiola Mártil, Carlos | 1 | | 7.
| Guarducci, Margherita | 1 | | 8.
| Guare, John | 1 | | 9.
| Guareschi | 1 | | 10.
| Guarienti, Carlo, 1923- | 1 |
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