| Author | Titles | | 1.
| Gaia, Francisco, 1933-2021 | 3 | | 2.
| Gaia, Leonel, 1871-1941 | 3 | | 3.
| Gaiaz, Ana, 1965- | 18 | | 4.
| Gaiaz, Ana Isabel, 1965- | 0 | | 5.
| Author is: Gaiaz, Ana, 1965- | 18 | | 6.
| Gaiaz, Ana Isabel Carrilho Rainha, 1965- | 0 | | 7.
| Author is: Gaiaz, Ana, 1965- | 18 | | 8.
| Gaibrois de Ballesteros, Mercedes | 1 | | 9.
| Gaidoschik, R. | 1 | | 10.
| Gaiduk, Alla | 1 | | 11.
| Gaiffe, Félix | 1 | | 12.
| Gaiffier, Baudouin de | 2 |
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