| Autor | Częstotliwość |
| Iorga, Nicolae, 1871-1940 05.06.1871-27.11.1940 |
3 |
| Friedrich-Andreas-Perthes-Aktiengesellschaft |
2 |
| Giesebrecht, Wilhelm von 1814-1889 |
2 |
| Heeren, Arnold H. L. 1760-1842 |
2 |
| Iorga, Nicolae 1871-1940 |
2 |
| Lamprecht, Karl 1856-1915 |
2 |
| Oncken, Hermann 1869-1945 |
2 |
| Perthes, Andreas 1813-1890 |
2 |
| Perthes, Emil 1841-1910 |
2 |
| Perthes, Friedrich Christoph 1772-1843 |
2 |
| Ukert, Friedrich August 1780-1851 |
2 |
| Iorga, Liliana N. |
1 |
