| Author | Titles | | 1.
| Costa, Sousa, 1879-1961 | 50 | | 2.
| Costa, Susana Goulart | 1 | | 3.
| Costa, Svetlana Sequeira | 1 | | 4.
| Costa, Telma | 7 | | 5.
| Costa, Teresa Poole da | 1 | | 6.
| Costa, Tiago Bartolomeu | 6 | | 7.
| Costa, Tomás, 1861-1932 | 2 | | 8.
| Costa, Tomás, 1861-1932 | 1 | | 9.
| Costa, Tomás Abbott, 1882-1940 | 0 | | 10.
| Costa, Tomás Figueiredo de Araújo, 1861-1932 | 0 |
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