| Author | Titles | | 1.
| Ludwig, Horst-Jörg | 1 | | 2.
| Ludwig, Karl H. C. | 1 | | 3.
| Ludwig, L. K. | 1 | | 4.
| Ludwig Museum ( Koblenz, Alemanha ) | 1 | | 5.
| Ludwig Museum of Contemporary Art (Budapeste, Hungria) | 1 | | 6.
| Ludwig Múzeum Budapest | 1 | | 7.
| Ludwig, Peter | 1 | | 8.
| Ludwig, Ryan 19--?- | 1 | | 9.
| Ludwig-Institut, (Oberhausen, Alemanha) | 1 | | 10.
| Ludwing, Emil | 1 |
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