| Author | Titles | | 1.
| Marcos, António | 3 | | 2.
| Marcos, Daniel | 1 | | 3.
| Marcos de Dios, Ángel | 2 | | 4.
| Marcos, Domingos dos Santos | 1 | | 5.
| Marcos, Esperanza Guillén, 1961- | 0 | | 6.
| Author is: Guillén, Esperanza, 1961- | 2 | | 7.
| Marcos, João | 1 | | 8.
| Marcos, Juliano, pseud. | 0 | | 9.
| Author is: Segurado, Jorge, 1898-1990 | 119 | | 10.
| Marcos, Luís Humberto | 5 | | 11.
| Marcos, Margarita Estella, 1930-2020 | 0 | | 12.
| Author is: Estella Marcos, Margarita M., 1930-2020 | 5 | | 13.
| Marcos, Maria Adelaide | 1 |
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